Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2016	Feb. 17, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Trading Symbol	BNFT
Entity Registrant Name	Benefitfocus,Inc.
Entity Central Index Key	0001576169
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,714,527
Entity Public Float			$ 373,329,249

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 56,853	$ 48,074
Marketable securities	2,007	40,448
Accounts receivable, net	28,340	27,616
Accounts receivable, related party, net	4,626	2,082
Prepaid expenses and other current assets	4,449	5,725
Total current assets	96,275	123,945
Property and equipment, net	80,518	55,037
Intangible assets, net	408	665
Goodwill	1,634	1,634
Other non-current assets	1,575	838
Total assets	180,410	182,119
Current liabilities:
Accounts payable	5,829	7,953
Accrued expenses	10,867	10,449
Accrued compensation and benefits	17,347	20,684
Deferred revenue, current portion	35,426	37,858
Revolving line of credit, current portion	20,000	25,000
Financing and capital lease obligations, current portion	2,604	3,648
Total current liabilities	92,073	105,592
Deferred revenue, net of current portion	40,412	55,671
Revolving line of credit, net of current portion	20,246	5,246
Financing and capital lease obligations, net of current portion	57,934	31,183
Other non-current liabilities	3,056	2,436
Total liabilities	213,721	200,128
Commitments and contingencies	0	0
Stockholders' deficit:
Preferred stock, par value $0.001, 5,000,000 shares authorized, no shares issued and outstanding at December 31, 2016 and 2015	0	0
Common stock, par value $0.001, 50,000,000 shares authorized, 30,429,014 and 29,194,332 shares issued and outstanding at December 31, 2016 and 2015, respectively	30	29
Additional paid-in capital	335,059	310,304
Accumulated deficit	(368,400)	(328,342)
Total stockholders' deficit	(33,311)	(18,009)
Total liabilities and stockholders' deficit	$ 180,410	$ 182,119

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	30,429,014	29,194,332
Common stock, shares outstanding	30,429,014	29,194,332

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenue	$ 233,335	$ 185,143	$ 137,420
Cost of revenue	120,681	102,851	87,470
Gross profit	112,654	82,292	49,950
Operating expenses:
Sales and marketing	55,488	58,589	48,467
Research and development	56,584	52,250	41,729
General and administrative	32,750	25,727	18,657
Total operating expenses	144,822	136,566	108,853
Loss from operations	(32,168)	(54,274)	(58,903)
Other income (expense):
Interest income	138	188	77
Interest expense on building lease financing obligations	(6,826)	(7,092)	(3,624)
Interest expense on other borrowings	(1,095)	(877)	(682)
Other expense	(90)	(4)	(22)
Total other expense, net	(7,873)	(7,785)	(4,251)
Loss before income taxes	(40,041)	(62,059)	(63,154)
Income tax expense	17	25	25
Net loss	(40,058)	(62,084)	(63,179)
Comprehensive loss	$ (40,058)	$ (62,084)	$ (63,179)
Net loss per common share:
Basic and diluted	$ (1.35)	$ (2.19)	$ (2.51)
Weighted-average common shares outstanding:
Basic and diluted	29,589,857	28,344,680	25,207,099

Consolidated Statements of Changes in Stockholders' Deficit - USD ($) $ in Thousands	Total	Common Stock, $0.001 Par Value	Additional Paid-in Capital	Accumulated Deficit
Balance (in shares) at Dec. 31, 2013		24,495,651
Balance at Dec. 31, 2013	$ 11,432	$ 24	$ 214,487	$ (203,079)
Exercise of stock options (in shares)		642,152
Exercise of stock options	2,818	$ 1	2,817
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes (in shares)		15,613
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes	(226)		(226)
Issuance of common stock for cashless exercise of warrant (in shares)		455,521
Issuance of common stock for cashless exercise of warrant		$ 1	(1)
Stock-based compensation expense	5,588		5,588
Accretion of customer warrant	744		744
Net loss	(63,179)			(63,179)
Balance (in shares) at Dec. 31, 2014		25,608,937
Balance at Dec. 31, 2014	(42,823)	$ 26	223,409	(266,258)
Exercise of stock options (in shares)		656,043
Exercise of stock options	4,229		4,229
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes (in shares)		111,826
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes	(2,116)		(2,116)
Issuance of common stock and warrant, net of issuance costs (in shares)		2,817,526
Issuance of common stock and warrant, net of issuance costs	74,331	$ 3	74,328
Stock-based compensation expense	10,454		10,454
Net loss	(62,084)			(62,084)
Balance (in shares) at Dec. 31, 2015		29,194,332
Balance at Dec. 31, 2015	$ (18,009)	$ 29	310,304	(328,342)
Exercise of stock options (in shares)	944,706	944,706
Exercise of stock options	$ 6,870	$ 1	6,869
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes (in shares)		289,976
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes	(202)		(202)
Stock-based compensation expense	18,088		18,088
Net loss	(40,058)			(40,058)
Balance (in shares) at Dec. 31, 2016		30,429,014
Balance at Dec. 31, 2016	$ (33,311)	$ 30	$ 335,059	$ (368,400)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net loss	$ (40,058)	$ (62,084)	$ (63,179)
Adjustments to reconcile net loss to net cash and cash equivalents (used in) provided by operating activities:
Depreciation and amortization	13,073	11,664	9,493
Stock-based compensation expense	18,088	10,454	5,588
Change in fair value and accretion of warrant	0	0	744
Interest accrual on financing obligation	6,827	7,092	3,624
Provision for doubtful accounts	667	22	0
Loss on disposal or impairment of property and equipment	141	18	25
Changes in operating assets and liabilities:
Accounts receivable, net	(3,936)	(7,800)	2,357
Accrued interest on short-term investments	220	205	162
Prepaid expenses and other current assets	1,626	(1,328)	833
Other non-current assets	339	1,380	824
Accounts payable	(1,849)	3,418	(199)
Accrued expenses	990	2,961	2,469
Accrued compensation and benefits	(3,337)	3,310	3,192
Deferred revenue	(17,690)	(1,189)	14,288
Other non-current liabilities	2,073	332	901
Net cash and cash equivalents used in operating activities	(22,826)	(31,545)	(18,878)
Cash flows from investing activities
Purchases of short-term investments held to maturity	(2,004)	(68,185)	(12,959)
Proceeds from short-term investments held to maturity	40,225	32,667	20,830
Purchases of property and equipment	(12,705)	(14,727)	(9,824)
Net cash and cash equivalents provided by (used in) investing activities	25,516	(50,245)	(1,953)
Cash flows from financing activities
Draws on revolving line of credit	84,000	57,492	14,000
Payments on revolving line of credit	(74,000)	(44,903)	(2,100)
Proceeds from exercises of stock options	6,870	4,229	2,817
Proceeds from issuance of common stock and warrant, net of issuance costs	0	74,538	0
Payments of deferred financing costs and debt issuance costs	(379)	(566)	0
Remittance of taxes upon vesting of restricted stock units	(202)	(2,116)	(226)
Payments on financing and capital lease obligations	(10,200)	(9,884)	(8,231)
Net cash and cash equivalents provided by financing activities	6,089	78,790	6,260
Net increase (decrease) in cash and cash equivalents	8,779	(3,000)	(14,571)
Cash and cash equivalents, beginning of year	48,074	51,074	65,645
Cash and cash equivalents, end of year	56,853	48,074	51,074
Supplemental disclosure of non-cash investing and financing activities
Property and equipment purchases in accounts payable and accrued expenses	699	1,489	4,226
Property and equipment purchased with financing and capital lease obligations	28,032	914	21,739
Post contract support purchased with financing obligations	1,048	272	754
Allocation of proceeds to deferred revenue from issuance of common stock based on relative selling price	0	207	0
Supplemental disclosure of cash flow information
Income taxes paid	7	18	38
Interest paid	$ 6,655	$ 6,525	$ 2,449

Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Description of Business	1. Organization and Description of Business Benefitfocus, Inc. (the “Company”) provides a leading cloud-based benefits management platform for consumers, employers, insurance carriers and brokers under a software-as-a-service (“SaaS”) model. The financial statements of the Company include the financial position and operations of its wholly owned subsidiaries, Benefitfocus.com, Inc., Benefit Informatics, Inc. and BenefitStore, Inc. Benefit Informatics, Inc. was dissolved on December 31, 2015.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Principles of Consolidation

These consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The Company is not the primary beneficiary of, nor does it have a controlling financial interest in, any variable interest entity. Accordingly, the Company has not consolidated any variable interest entity.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the reported amounts in the consolidated financial statements and accompanying notes. Such estimates include revenue recognition and the customer relationship period, allowances for doubtful accounts and returns, valuations of deferred income taxes, long-lived assets, warrants, capitalizable software development costs and the related amortization, stock-based compensation, the determination of the useful lives of assets, and the impairment assessment of acquired intangibles and goodwill. Determination of these transactions and account balances are based on the Company’s estimates and judgments. These estimates are based on the Company’s knowledge of current events and actions it may undertake in the future as well as on various other assumptions that it believes to be reasonable. Actual results could differ materially from these estimates.

Revenue and Deferred Revenue

The Company derives the majority of its revenue from software services fees, which consist primarily of monthly subscription fees paid by customers for access to and usage of the Company’s cloud-based benefits software solutions for a specified contract term. The Company also derives revenue from professional services which primarily include fees related to the integration of customers’ systems with the Company’s platform, which typically includes discovery, configuration, deployment, testing, and training.

The Company recognizes revenue when there is persuasive evidence of an arrangement, the service has been provided, the fees to be paid by the customer are fixed and determinable and collectability is reasonably assured. The Company considers delivery of its cloud-based software services has commenced once access to a configured and live instance to its platform has been granted to the customer.

The Company’s arrangements generally contain multiple elements comprised of software services and professional services. The Company evaluates each element in an arrangement to determine whether it represents a separate unit of accounting. An element constitutes a separate unit of accounting when the delivered item has standalone value and delivery of the undelivered element is probable and within the Company’s control.

When multiple deliverables included in an arrangement are separable into different units of accounting, the arrangement consideration is allocated to the identified units of accounting based on their relative selling price. Multiple deliverable arrangements accounting guidance provides a hierarchy to use when determining the relative selling price for each unit of accounting. Vendor-specific objective evidence (“VSOE”) of selling price, based on the price at which the item is regularly sold by the vendor on a standalone basis, should be used if it exists. If VSOE of selling price is not available, third-party evidence (“TPE”) of selling price is used to establish the selling price if it exists. VSOE and TPE do not currently exist for any of the Company’s deliverables. Accordingly, for arrangements with multiple deliverables that can be separated into different units of accounting, the arrangement consideration is allocated to the separate units of accounting based on the Company’s best estimate of selling price. The amount of arrangement consideration allocated is limited by contingent revenues, if any.

Effective July 1, 2015, the Company determined it had established standalone value for Benefitfocus Marketplace implementation services in the Employer segment as they can be sold separately from the software services. This was primarily due to the system integrators that have been trained and certified to perform these implementation services, the successful completion of an implementation by a trained system integrator, and the sale of several software subscription arrangements to customers in the Employer segment without the Company’s implementation services. Accordingly, revenues related to implementation services for the Benefitfocus Marketplace solution in the Employer segment that are delivered after July 1, 2015 are recognized separately from the revenues earned from the Employer software subscription services. Revenues related to such implementation services are recognized at the time that the professional services have been completed. Prior to July 1, 2015, the Company did not have standalone value for implementation services related to the Benefitfocus Marketplace solution as the Company had historically performed these services to support customers’ implementation of this solution. Revenue from implementation services with standalone value was $2,083 and $2,401 for the years ended December 31, 2016 and 2015, respectively.

Certain of the Company’s other professional services, including implementation services related to the Carrier segment, are not sold separately from the software services and there is no alternative use for them. As such, the Company has determined that those professional services do not have standalone value. Accordingly, software services and professional services are combined and recognized as a single unit of accounting. The Company generally recognizes software services fees monthly based on the number of employees covered by the relevant benefits plans at contracted rates for a specified period of time, once the criteria for revenue recognition described above have been satisfied. The Company recognizes revenue on Benefitfocus Marketplace implementation services in the Employer segment that have standalone value at the time the services have been completed and the related software services have commenced. The Company defers recognition of revenue for fees from professional services that do not have standalone value and begins recognizing such revenue once the services are delivered and the related software services have commenced, ratably over the longer of the contract term or the estimated expected life of the customer relationship. Costs incurred by the Company in connection with providing such professional services are charged to expense as incurred and are included in “Cost of revenue.”

In January 2015, the Company adjusted the estimated expected life of its customer relationship. This change in estimate was the result of analyzing quantitative and qualitative observations in the market and the Company’s business. This change shortens the term over which deferred revenue will be recognized from 10 to 7 years and was applied prospectively to unamortized professional services fees over the longer of the contract term or the adjusted estimated expected life of the customer relationship.

The change in the customer relationship period increased the amount of revenue recognized during the year ended December 31, 2015, which decreased both loss from operations and net loss by $6,207, and decreased loss per share by $0.22 for the year ended December 31, 2015. As a result of the change in the customer relationship period, Employer and Carrier revenue increased by $1,137 and $5,070, respectively, for the year ended December 31, 2015. Based on the Company’s assessment for the year ended December 31, 2016, there has been no change in the customer relationship period.

Cost of Revenue

Cost of revenue primarily consists of employee compensation, professional services, data center co-location costs, networking expenses, depreciation expense for computer equipment directly associated with generating revenue, amortization expense for capitalized software development costs, and infrastructure maintenance costs. In addition, the Company allocates a portion of overhead, such as rent, additional depreciation and amortization expense, and employee benefit costs, to cost of revenue based on headcount.

Cash and Cash Equivalents

Cash and cash equivalents consist of bank checking accounts and money market accounts. The Company considers all highly liquid investments with original maturities of three months or less at the time of purchase to be cash equivalents.

Marketable Securities

Marketable securities consist of short-term investments in corporate bonds, commercial paper, and various U.S. government backed securities. To reflect its intention, the Company classifies its marketable securities as held-to-maturity at the time of purchase. As a result, the marketable securities are recorded at amortized cost and any gains or losses realized upon maturity are reported in other expense, net in the consolidated statements of operations and comprehensive loss.

Concentrations of Credit Risk

The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash equivalents, marketable securities and accounts receivable. All of the Company’s cash and cash equivalents are held at financial institutions that management believes to be of high credit quality. The bank deposits of the Company might, at times, exceed federally insured limits and are generally uninsured and uncollateralized. The Company has not experienced any losses on cash and cash equivalents to date.

To manage credit risk related to marketable securities, the Company invests in various types of highly rated corporate bonds, commercial paper, and various U.S. government backed securities with maturities of less than two years. The weighted average maturity of the portfolio of investments must not exceed nine months, per the Company’s investment policy.

To manage accounts receivable risk, the Company evaluates the creditworthiness of its customers and maintains an allowance for doubtful accounts. Accounts receivable were unsecured and were derived from revenue earned from customers located in the United States. Accounts receivable from one customer represented approximately 13% and 22% of the total accounts receivable at December 31, 2016 and 2015, respectively. Mercer LLC (“Mercer”), a related party, represented approximately 14% of the total accounts receivable at December 31, 2016 and 11% of total revenue for the year ended December 31, 2016. For more information regarding Mercer revenue, please see Note 15.

No customer represented more than 10% of total revenue for the years ended December 31, 2015 and 2014.

Accounts Receivable and Allowance for Doubtful Accounts and Returns

Accounts receivable are stated at realizable value, net of allowances for doubtful accounts and estimated returns. The Company utilizes the allowance method to provide for doubtful accounts based on management’s evaluation of the collectability of amounts due, and other relevant factors. Bad debt expense is recorded in general and administrative expense on the consolidated statements of operations and comprehensive loss. The Company’s estimate is based on historical collection experience and a review of the current status of accounts receivable. Historically, actual write-offs for uncollectible accounts have not significantly differed from the Company’s estimates. The Company removes recorded receivables and the associated allowances when they are deemed permanently uncollectible. However, higher than expected bad debts may result in future write-offs that are greater than the Company’s estimates. The allowance for doubtful accounts was $691 and $32 as of December 31, 2016 and 2015, respectively.

The allowances for returns are accounted for as reductions of revenue and are estimated based on the Company’s periodic assessment of historical experience and trends. The Company considers factors such as the time lag since the initiation of revenue recognition, historical reasons for adjustments, new customer volume, delivery issues or delays, and past due customer billings. The allowance for returns was $3,904 and $2,553 as of December 31, 2016 and 2015, respectively.

Property and Equipment and Capitalized Software Development Costs

Property and equipment, including capitalized software development costs, are stated at cost less accumulated depreciation and amortization. Expenditures for major additions and improvements are capitalized. Depreciation and amortization is recognized over the estimated useful lives of the related assets using the straight-line method.

The estimated useful lives for significant property and equipment categories are generally as follows:

Buildings		30 years
Computers and related equipment		3-5 years
Purchased software and licenses		1-7 years
Developed software		3 years
Furniture and fixtures		7 years
Leasehold improvements		Lesser of estimated useful life of asset or lease term
Other equipment		5-12 years
Vehicles		5 years

Useful lives of significant assets are periodically reviewed and adjusted prospectively to reflect the Company’s current estimates of the respective assets’ expected utility. Costs associated with maintenance and repairs are expensed as incurred.

In the event the Company has been deemed the owner for accounting purposes of construction projects in build-to-suit lease arrangements, the estimated construction costs incurred to date are recorded as assets in Property and Equipment, net. Upon occupancy of facilities under build-to-suit leases, the Company assesses whether arrangements qualify for sales recognition under the sale-leaseback accounting guidance. If the Company continues to be the deemed owner for accounting purposes, the cost of the building is depreciated over its estimated useful life.

The Company capitalizes certain costs related to its software developed or obtained for internal use. Costs related to preliminary project activities and post-implementation activities are expensed as incurred. Internal and external costs incurred during the application development stage, including upgrades and enhancements representing modifications that will result in significant additional functionality, are capitalized. Software maintenance and training costs are expensed as incurred. Capitalized costs are recorded as part of property and equipment and are amortized on a straight-line basis over the software’s estimated useful life which is three years. The Company evaluates these assets for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets.

Identifiable Intangible Assets

Identifiable intangible assets with finite lives are recorded at their fair values at the date of acquisition and are amortized on a straight-line basis over their respective estimated useful lives, which is the period over which the asset is expected to contribute directly or indirectly to future cash flows. As of December 31, 2016, the estimated remaining useful life used in computing amortization was 1.6 years.

Impairment of Long-Lived Assets and Goodwill

The Company reviews long-lived assets and definite-lived intangible assets for impairment whenever events or changes in circumstances indicate the carrying amount of an asset might not be recoverable. Recoverability of the long-lived asset is measured by a comparison of the carrying amount of the asset or asset group to future undiscounted net cash flows expected to be generated. If such assets are not recoverable, the impairment to be recognized, if any, is measured as the amount by which the carrying amount of the assets exceeds the estimated fair value (discounted cash flow) of the assets or asset group. Assets held for sale are reported at the lower of the carrying amount or fair value, less costs to sell.

Goodwill represents the excess of the aggregate of the fair value of consideration transferred in a business combination over the fair value of assets acquired, net of liabilities assumed. Goodwill is not amortized; rather, goodwill is tested for impairment at the reporting unit level as of October 31 of each year, or more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value.

The Company performs a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value before performing a two-step approach to testing goodwill for impairment for each reporting unit. The reporting units are determined by the components of the Company’s operating segments that constitute a business for which both (1) discrete financial information is available and (2) segment management regularly reviews the operating results of that component. If it is more likely than not that the fair value of a reporting unit is less than its carrying value, the Company performs the impairment test by applying a fair-value-based test. The first step measures for impairment by applying fair-value-based tests at the reporting unit level. The second step (if necessary) measures the amount of impairment by applying fair-value-based tests to the individual assets and liabilities within each reporting unit.

As part of determining its reporting units, the Company has identified two operating segments, Employer and Carrier. To determine the fair value of the Company’s reporting units, the Company has used a discounted cash flow analysis, which requires significant assumptions and estimates about future operations. Significant judgments inherent in this analysis include the determination of an appropriate discount rate, estimated terminal value and the amount and timing of expected future cash flows. The Company may also determine fair value of its reporting units using a market approach by applying multiples of earnings of peer companies to its operating results.

Financing Obligations

In its build-to-suit lease arrangements where the Company is involved in the construction of its buildings, the Company is deemed the owner for accounting purposes during the construction period. The Company records an asset for the amount of the total project costs in Property and Equipment, net and the related financing obligation in Financing and Capital Lease Obligations on the Consolidated Balance Sheet. Once construction is complete, the Company determines if the asset qualifies for sale-leaseback accounting treatment. If the arrangement does not qualify for sale-lease back treatment, the Company continues to reduce the obligation over the lease term as payments are made and depreciates the asset over its useful life. The Company does not report rent expense for the portion of the rent payment determined to be related to the assets that it owns for accounting purposes. Rather, this portion of the rent payment under the lease is recognized as a reduction of the financing obligation and as interest expense.

Financing obligations also include liabilities for the purchase of licenses.

Sales Commissions

Sales commissions are generally expensed when the sales contract is executed by the customer.

Advertising

The Company expenses advertising costs as they are incurred. Direct advertising costs for the years ended December 31, 2016, 2015, and 2014 were $635, $435 and $394, respectively.

Comprehensive Loss

The Company’s net loss equals comprehensive loss for all periods presented.

Stock-Based Employee Compensation

Stock-based employee compensation is measured based on the grant-date fair value of the awards and recognized in the Consolidated Statements of Operations and Comprehensive Loss over the period during which the award holder is required to perform services in exchange for the award, which is the vesting period. Compensation expense is recognized over the vesting period of the applicable award using the straight-line method. Compensation expense related to performance-based restricted stock units, which are accounted for as equity awards, is recognized when it is probable that the performance measure will be met. Compensation costs related to restricted stock units (“RSUs”) is recorded based on the market price on the grant date. The Company uses the Black-Scholes option pricing model for estimating the fair value of stock options. The use of the option valuation model requires the input of subjective assumptions, including the expected life of the option and the expected stock price volatility. Additionally, the recognition of stock-based compensation expense requires the estimation of the number of options and RSUs that will ultimately vest and the number of options and RSUs that will ultimately be forfeited. The recognition of stock-based compensation expense associated with performance-based restricted stock units requires the estimation of the probability of achieving performance measures.

Income Taxes

The Company uses the asset and liability method for income tax accounting. This method requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax basis of assets and liabilities, as well as for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using the tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. Valuation allowances are recorded to reduce deferred tax assets to the amount the Company believes is more likely than not to be realized. The tax benefits of uncertain tax positions are recognized only when the Company believes it is more likely than not that the tax position will be upheld on examination by the taxing authorities based on the merits of the position. The Company recognizes interest and penalties, if any, related to unrecognized income tax benefits in income tax expense.

In December 2015, the Company adopted ASU No. 2015-17, “Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes (ASU 2015-17).” This standard simplifies the presentation of the deferred tax assets and liabilities on the balance sheet and requires companies to classify all deferred tax assets and liabilities as noncurrent. The Company prospectively applied this standard which had no impact on the consolidated balance sheets.

Basic and Diluted Net Loss per Common Share

The Company uses the two-class method to compute net loss per common share because the Company has issued securities, other than common stock, that contractually entitle the holders to participate in dividends and earnings of the Company. The two-class method requires earnings for the period to be allocated between common stock and participating securities based upon their respective rights to receive distributed and undistributed earnings. Holders of each series of the Company’s redeemable convertible preferred stock were entitled to participate in distributions, when and if declared by the board of directors that are made to common stockholders, and as a result are considered participating securities.

Under the two-class method, for periods with net income, basic net income per common share is computed by dividing the net income attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Net income attributable to common stockholders is computed by subtracting from net income the portion of current year earnings that the participating securities would have been entitled to receive pursuant to their dividend rights had all of the year’s earnings been distributed. No such adjustment to earnings is made during periods with a net loss, as the holders of the participating securities have no obligation to fund losses. Diluted net loss per common share is computed under the two-class method by using the weighted-average number of shares of common stock outstanding plus, for periods with net income attributable to common stockholders, the potential dilutive effects of stock awards and warrants. In addition, the Company analyzes the potential dilutive effect of the outstanding participating securities under the “if-converted” method when calculating diluted earnings per share, in which it is assumed that the outstanding participating securities convert into common stock at the beginning of the period. The Company reports the more dilutive of the approaches (two-class or “if-converted”) as its diluted net income per share during the period. Due to net losses for the years ended December 31, 2016, 2015, and 2014 basic and diluted loss per share were the same, as the effect of potentially dilutive securities would have been anti-dilutive.

Recent Accounting Pronouncements

In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-04, "Simplifying the Test for Goodwill Impairment." It eliminates Step 2 from the goodwill impairment test and an entity should recognize an impairment charge for the amount by which the carrying amount of goodwill exceeds the reporting unit's fair value, not to exceed the carrying amount of goodwill. This guidance is effective for annual and any interim impairment tests in fiscal years beginning after December 15, 2019. The Company does not expect this guidance to have any impact on its Consolidated Financial Statements.

In January 2017, the FASB ASU No. 2017-01, "Clarifying the Definition of a Business." It revises the definition of a business and provides a framework to evaluate when an input and a substantive process are present in an acquisition to be considered a business. This guidance is effective for annual periods beginning after December 15, 2017. The Company does not expect this guidance to have any impact on its Consolidated Financial Statements.

In November 2016, the FASB issued ASU No. 2016-18, "Restricted Cash." It requires that amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017. The Company does not expect this guidance to have a material impact on its Consolidated Financial Statements.

In August 2016, the FASB issued ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments." It provides guidance on eight specific cash flow issues with the objective of reducing the existing diversity in practice in how they are classified in the statement of cash flows. This guidance is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The Company does not expect this guidance to have a material impact on its Consolidated Financial Statements.

In June 2016, the FASB ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments.” The purpose of this ASU is to require a financial asset measured at amortized cost basis to be presented at the net amount expected to be collected. Credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. This ASU is effective for interim and annual reporting periods beginning after December 15, 2019. The Company is currently evaluating the impact of this guidance on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, “Improvements to Employee Share-Based Payment Accounting.” The amendments in this update simplify several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cash flows. ASU 2016-09 will be effective for the Company beginning January 1, 2017, but early adoption is permitted. The Company does not expect this guidance to have a material impact on its Consolidated Financial Statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842).” The amendments in this update require lessees, among other things, to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous authoritative guidance. This update also introduces new disclosure requirements for leasing arrangements. ASU 2016-02 will be effective for the Company beginning January 1, 2019, but early adoption is permitted. The Company is currently evaluating the impact of this update on the consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer's Accounting for Fees Paid in a Cloud Computing Arrangement.” The amendments in this update provide guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the update specifies that the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. The update further specifies that the customer should account for a cloud computing arrangement as a service contract if the arrangement does not include a software license. The Company adopted ASU 2015-05 as of January 1, 2016 on a prospective basis. The adoption of this standard did not materially impact the Company’s consolidated financial statements.

In April 2015, the FASB issued ASU No. 2015-03, “Interest - Imputation of Interest (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs.” The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The Company adopted this standard as of January 1, 2016. The adoption of this standard did not materially impact the Company’s consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements - Going Concern (Subtopic 205-40).” ASU 2014-15 provides guidance in GAAP about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. This guidance was effective for the Company as of December 31, 2016. The adoption of this standard did not have a material effect on its consolidated financial statements as of December 31, 2016.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers”, which amends the revenue recognition requirements in the FASB Accounting Standards Codification. Under the new standard, revenue is recognized when a customer obtains control of promised goods or services and is recognized in an amount that reflects the consideration that the entity expects to receive in exchange for those goods and services. In addition, the standard requires disclosure of the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The FASB has recently issued several amendments to the standard, including clarification on accounting for licenses of intellectual property and identifying performance obligations.

The standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective), or retrospectively with the cumulative effect of initially applying this statement recognized at the date of initial application (modified retrospective transition method). The new standard will be effective for the Company beginning January 1, 2018, with an option to early adopt. The Company plans to adopt the standard on the effective date but has not made a determination on the adoption method.

While the Company is continuing to assess all potential impacts of the standard, it has initially identified certain areas that might be more significantly affected, including the timing of revenue recognition for certain of its professional services and the accounting for sales commissions, which are currently expensed as incurred. The Company is also continuing to review the impact of this standard on potential disclosure changes in its consolidated financial statements as well as which transition approach will be applied. The Company cannot currently estimate the impact of adopting this standard. The Company is also in the process of evaluating changes to its business process and controls in order to support revenue recognition and disclosure under the new standard.

Net Loss Per Common Share

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Net Loss Per Common Share

3. Net Loss Per Common Share

Diluted loss per common share is the same as basic loss per common share for all periods presented because the effects of potentially dilutive items were anti-dilutive given the Company’s net loss. The following common share equivalent securities have been excluded from the calculation of weighted-average common shares outstanding because the effect is anti-dilutive for the periods presented:

	Year Ended December 31,
Anti-Dilutive Common Share Equivalents	2016		2015		2014
Redeemable convertible preferred stock:
Series A		-		-		-
Series B		-		-		-
Restricted stock units		1,467,811		1,017,450		720,370
Stock options		727,559		1,684,843		2,382,881
Warrant to purchase common stock		580,813		580,813		-
Employee Stock Purchase Plan		3,964		-		-
Total anti-dilutive common share equivalents		2,780,147		3,283,106		3,103,251

Basic and diluted net loss per common share is calculated as follows:

	Year Ended December 31,
	2016			2015			2014
Numerator:
Net loss	$	(40,058	)	$	(62,084	)	$	(63,179	)
Net loss attributable to common stockholders	$	(40,058	)	$	(62,084	)	$	(63,179	)
Denominator:
Weighted-average common shares outstanding, basic and diluted		29,589,857			28,344,680			25,207,099
Net loss per common share, basic and diluted	$	(1.35	)	$	(2.19	)	$	(2.51	)

Marketable Securities

12 Months Ended

Dec. 31, 2016

Investments Debt And Equity Securities [Abstract]

Marketable Securities

4. Marketable Securities

Marketable securities consist of corporate bonds, commercial paper and U.S. Treasury and agency bonds, and are classified as held-to-maturity. Corporate bonds held in marketable securities had contractual maturities of less than 1 month as of December 31, 2016. The following presents information about the Company’s marketable securities as of December 31:

	2016		2015
Aggregate cost basis and net carrying amount	$	2,007	$	40,448
Gross unrealized holding gains		-		1
Gross unrealized holding losses		-		(26	)
Aggregate fair value determined by Level 2 inputs	$	2,007	$	40,423

The following table presents information about the Company’s investments that were in an unrealized loss position and for which an other-than-temporary impairment had not been recognized in earnings as of December 31:

	2016		2015
Aggregate fair value of investments with unrealized losses ⁽¹⁾	$	-	$	27,070
Aggregate amount of unrealized losses	$	-	$	(26	)

(1)	Investments have been in a continuous loss position for less than 12 months

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Fair Value Measurement

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurement

5. Fair Value Measurement

The carrying amounts of certain of the Company’s financial instruments, including cash and cash equivalents, net accounts receivable, accounts payable and other accrued liabilities, and accrued compensation and benefits, approximate fair value due to their short-term nature. The carrying value of the Company’s financing obligations and revolving line of credit approximates fair value, considering the borrowing rates currently available to the Company for financing obligations with similar terms and credit risks.

The Company uses a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. The hierarchy requires the Company to use observable inputs when available, and to minimize the use of unobservable inputs when determining fair value. The three tiers are defined as follows:

Level 1. Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2. Other inputs that are directly or indirectly observable in the marketplace.

Level 3. Unobservable inputs for which there is little or no market data, which require the Company to develop its own assumptions.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The Company evaluates its financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level to classify them for each reporting period. This determination requires significant judgments to be made.

The following tables present information about the Company’s assets and liabilities that are measured at fair value on a recurring basis using the above categories, as of December 31, 2016 and 2015.

	December 31, 2016
Description	Level 1		Level 2		Level 3		Total
Cash Equivalents:
Money market mutual funds ⁽¹⁾	$	51,285	$	-	$	-	$	51,285
Total assets	$	51,285	$	-	$	-	$	51,285

	December 31, 2015
Description	Level 1		Level 2		Level 3		Total
Cash Equivalents:
Money market mutual funds ⁽¹⁾	$	46,905	$	-	$	-	$	46,905
Total assets	$	46,905	$	-	$	-	$	46,905

(1)

Money market mutual funds are classified as cash equivalents in the Company’s consolidated balance sheets. As short-term, highly liquid investments readily convertible to known amounts of cash, with remaining maturities of three months or less at the time of purchase, the Company’s cash equivalent money market funds have carrying values that approximate fair value.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Property and Equipment

12 Months Ended

Dec. 31, 2016

Property Plant And Equipment [Abstract]

Property and Equipment

6. Property and Equipment

Property and equipment consists of the following as of December 31:

	2016			2015
Buildings, leased	$	48,558		$	29,291
Computers and related equipment		33,924			24,505
Purchased software and licenses		25,982			23,354
Developed software		26,142			20,900
Furniture and fixtures		6,668			6,651
Leasehold improvements		4,348			4,101
Other equipment		2,072			2,117
Vehicles		111			111
Construction in progress		319			412
Total property and equipment, at cost		148,124			111,442
Accumulated depreciation and amortization		(67,606	)		(56,405	)
Property and equipment, net	$	80,518		$	55,037

Depreciation and amortization expense on property and equipment was $12,816, $11,378 and $9,188, for the years ended December 31, 2016, 2015 and 2014, respectively. Property and equipment at December 31, 2016 and 2015 includes fixed assets acquired under capital lease agreements of $35,761 and $9,131, respectively. Accumulated depreciation of assets under capital leases totaled $5,194 and $3,126 as of December 31, 2016 and 2015, respectively. Amortization of assets under capital leases is included in depreciation expense.

The Company capitalized software development costs of $5,242 and $2,503 for the years ended December 31, 2016 and 2015, respectively. Amortization of capitalized software development costs totaled $2,857, $2,587 and $2,257 during the years ended December 31, 2016, 2015 and 2014, respectively. The net book value of capitalized software development costs was $6,435 and $4,049 at December 31, 2016, and 2015, respectively.

Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

7. Goodwill and Intangible Assets

The Company’s goodwill balance of $1,634 is solely attributable to the Employer reporting unit. The gross carrying amount and accumulated impairment losses were $3,304 and $(1,670), respectively, for the beginning and ending balances in all periods presented. There were no changes in the carrying amount of goodwill in the years ended December 31, 2016 and 2015.

Information regarding the Company’s acquisition-related intangible assets is as follows:

	As of December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted- Average Remaining Useful Life (in years)
Trademarks	$	240	$	(240	)	$	-		-
Customer agreements		2,060		(1,652	)		408		1.6
Non-compete agreements		126		(126	)		-		-
Total	$	2,426	$	(2,018	)	$	408		1.6

	As of December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted- Average Remaining Useful Life (in years)
Trademarks	$	240	$	(240	)	$	-		-
Customer agreements		2,060		(1,395	)		665		2.6
Non-compete agreements		126		(126	)		-		-
Total	$	2,426	$	(1,761	)	$	665		2.6

Amortization expense of acquisition-related intangible assets for the years ended December 31, 2016, 2015 and 2014 was $257, $286 and $305, respectively. As of December 31, 2016, expected amortization expense for the intangible assets for the remaining useful life was as follows:

2017	$	258
2018		150
Total	$	408

There were no impairments of intangible assets during the years ended December 31, 2016, 2015 and 2014.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Revolving Line of Credit	12 Months Ended
Revolving Line of Credit	Dec. 31, 2016
Debt Disclosure [Abstract]
Revolving Line of Credit	8. Revolving Line of Credit On August 27, 2013, the Company executed a loan and security agreement with Silicon Valley Bank for a revolving line of credit (“Revolver”) in the initial amount of up to $15,000 for working capital, to fund general business requirements, and to repay the indebtedness under its then existing master credit facility and other senior secured promissory notes. At the beginning of 2014, the borrowing limit under the Revolver was increased from $15,000 to $35,000 at the request of the Company in accordance with the terms of the agreement, as amended on December 10, 2013. In February 2015, the Company replaced its Revolver with a senior revolving line of credit (“Senior Revolver”) with a syndicate of lenders led by Silicon Valley Bank. The Company borrowed $18,246 under the Senior Revolver, of which $17,657 repaid the principal of the Revolver and $589 paid accrued interest, as well as administrative and legal fees related to the issuance of the Senior Revolver. Debt issuance fees of $591 were capitalized in the Company’s balance sheet and are amortized over the life of the Senior Revolver. The Senior Revolver had an original borrowing limit of $60,000 and an original term of three years. Borrowing capacity under the Senior Revolver is subject to a borrowing base limit that is a function of the Company’s monthly recurring revenue as adjusted to reflect lost customer revenue during the previous three calendar months. Therefore, credit available under the Senior Revolver may be less than the borrowing limit. Interest is payable monthly. Advances under the Senior Revolver bear interest at the prime rate as published in the Wall Street Journal plus a margin based on the Company’s liquidity, which originally ranged between 1.0% and 1.5%. The Company is charged an unused line fee under this arrangement at a rate based on its liquidity, which was originally 0.300% to 0.375% per year. Any outstanding principal is due at the end of the term. In October and December 2016, the Company amended its Senior Revolver agreement. The October amendment, among other things, increased the borrowing capacity to $95,000, extended the termination date of the facility to February 20, 2020, and added Goldman Sachs Lending Partners LLC to the lending syndicate. The October amendment altered definitions in the Senior Revolver agreement, including Alternate Base Rate, Applicable Margin, Consolidated EBITDA, Liquidity and Commitment Fee Rate. As a result of certain of these definitional changes, the Alternate Base Rate was modified to be the prime rate as published in the Wall Street Journal plus a margin based on our liquidity that ranges between 0.75% and 1.25%. Certain covenants were also revised, including those related to accounts receivable, Minimum Consolidated EBITDA requirements, Indebtedness, permitted Indebtedness and certain capital expenditure limits. The October amendment further waived any default that may have occurred as a result of certain Indebtedness previously incurred by the Company and the disclosure to the lenders of registered Intellectual Property. In connection with the October amendment, debt issuance fees of $379 were capitalized in the Company’s balance sheet and are being amortized over the remaining life of the Senior Revolver. The December amendment revised the covenant restricting Indebtedness in the Senior Revolver agreement to increase the basket for the Company and its subsidiaries’ building lease obligations, to the extent those would be characterized as Indebtedness under the Senior Revolver agreement. The Company is bound by customary affirmative and negative covenants in connection with the Senior Revolver agreement, including financial covenants related to liquidity and EBITDA. In the event of a default, the lenders may declare all obligations immediately due and stop advancing money or extending credit under the line of credit. The line of credit is collateralized by substantially all of the Company’s tangible and intangible assets, including intellectual property and the equity of subsidiaries. During 2016 and 2015, the Company borrowed an aggregate of $84,000 and $39,246, respectively, under the Senior Revolver for general operating purposes and repaid an aggregate of $74,000 and $27,246, respectively. As of December 31, 2016, the amount outstanding under the Senior Revolver was $40,246 and the amount available to borrow was $29,505. The amount outstanding, which represents principal and currently bears interest at 4.75%, is due February 2020. No other principal amounts are due in any other year.

Commitment and Contingencies

12 Months Ended

Dec. 31, 2016

Commitments And Contingencies Disclosure [Abstract]

Commitment and Contingencies

9. Commitment and Contingencies

The Company leases three buildings on its Charleston, South Carolina campus. One leasing arrangement is accounted for as a capital lease. The remaining two lease agreements are accounted for as build-to-suit, failed sale-leaseback arrangements. Accordingly, the Company recognized liabilities for the lease payments related to these two buildings, which have been recorded as financing obligations. A portion of the lease payment for these two leases has been allocated to land and is accounted for using operating lease accounting. Information regarding these three leases is incorporated in the following disclosures.

Operating Lease Commitments

The Company leases office facilities under various non-cancelable operating lease agreements with original lease periods expiring between 2017 and 2031. Some of the leases provide for renewal terms at the Company’s option. Certain future minimum lease payments due under these operating lease agreements contain free rent periods or escalating rent payment provisions. These leases generally do not contain purchase options. Rent expense on these operating leases is recognized over the term of the lease on a straight-line basis.

Rent expense totaled $4,403, $4,376 and $4,099 for the years ended December 31, 2016, 2015 and 2014, respectively.

Future minimum lease payments are as follows:

	Operating Leases
Year Ending December 31,
2017	$	1,345
2018		1,103
2019		1,117
2020		816
2021		773
Thereafter		9,131
Total minimum lease payments	$	14,285

Financing and Capital Lease Obligations

The Company has entered into various purchase arrangements to obtain property and equipment for operations that are accounted for as capital leases. Certain purchase arrangements contain payments for licenses, which the Company records as financing obligations. These arrangements have original terms ranging from 2 to 5 years with interest rates ranging from 0.5% to 13.6%. The leases are secured by the underlying leased property and equipment.

In December 2016, the Company amended a lease agreement for office space that had been previously accounted for as an operating lease. The amendment extended the term of the lease by 15 years from the amendment date. This modification required the Company to evaluate the lease as if it were a new lease. Upon evaluation, the lease was classified as a capital lease because the present value of the lease payments exceeded 90% of the fair value of the leased asset. Aggregate payments under this lease are $ 48,600, including executory costs of $5,938. As of December 31, 2016, capital lease obligations include amounts under this lease of $20,720. Details of the lease extension are disclosed under “Contractual Commitments” below.

In December 2016, the Company entered into a lease with a 39-month term for data storage equipment. The total payments under the lease are $6,373. The lease provides for a bargain purchase option at the end of its term. As of December 31, 2016, capital lease obligations include amounts under this lease of $5,080.

Financing obligations were $33,665 and $32,089, as of December 31, 2016 and 2015, respectively, and consist primarily of obligations for build-to-suit lease arrangements. The aggregate amount of future minimum payments for financing obligations was $117,439 at December 31, 2016, which includes aggregate payments of $114,832 related to build-to-suit arrangements. Details of the build-to-suit lease arrangements are disclosed in Note 15.

Financing obligations are allocated as follows:

	As of December 31,
	2016			2015
Buildings, build-to-suit	$	31,326		$	30,494
Software and support		2,339			1,595
Total financing obligations	$	33,665		$	32,089
Less: current portion		(757	)		(1,577	)
Financing obligations, net of current portion	$	32,908		$	30,512

Future minimum lease payments are as follows:

	Capital Leases			Financing Obligations
Year Ending December 31,
2017	$	4,935		$	7,071
2018		5,089			7,759
2019		4,981			6,859
2020		3,397			6,747
2021		2,941			6,949
Thereafter		34,726			82,054
Total minimum lease and financing obligation payments		56,069		$	117,439
Less: executory costs		(5,938	)
Less: imputed interest		(23,258	)
Less: current portion		(1,847	)
Capital lease obligations, net of current portion	$	25,026

Contractual Commitments

In connection with a 2013 lease for office space on its Charleston, South Carolina campus, the Company entered into an option to lease space in two additional adjacent buildings. The option term was 36 months and required the Company to incur costs annually prior to the exercise of the option in the amount of up to $466 per year. If the Company terminated the option or did not exercise the option prior to expiration it would incur termination fees pro-rated through the dates of termination or expiration. The maximum liability for termination fees was $757. During the year ended December 31, 2016, the Company determined that the options would expire unexercised and expensed the full amount of the termination fees.

On December 12, 2016, the Company executed an amendment to each of three lease agreements for office space on its Charleston, South Carolina campus. The amendments extended the term of the leases to December 31, 2031. The amendments also provided for the following:

•

extending from December 13, 2016 to December 31, 2018 the term of an option that allows the Company to require the lessors to build a two-story building, including potentially for a welcome center, of approximately 18,500 square feet on its campus (“Building 5”) for the Company to lease;

•

waiving accrued and future carrying costs and termination fees otherwise payable to the lessors by the Company under the existing option in the amount of $1,223; and

•

contingent upon construction of Building 4 described below, reducing the annual rent increases from 3% to 2% for the Company’s Customer Success Center, a 145,800 square foot building on its campus which it first occupied on January 1, 2015.

The waived carrying and termination fees in the amount of $1,223 will be amortized over the 15-year term of the extension as a reduction of interest and rent expense.

On December 12, 2016, the Company also executed a lease agreement pursuant to which the lessor will construct a building of approximately 145,800 square feet on its campus for the Company to accommodate anticipated future growth (“Building 4”). The target commencement date of the lease is July 1, 2019 with a term of 15 years. Under the terms of the lease, the Company agrees to commence construction on or about April 1, 2018, but can terminate the lease prior to that time, subject to the payment of reasonable, documented, and agreed-to out-of-pocket costs with respect to the lease and building to date. If the Company delays beginning construction past December 31, 2018, the lessor may terminate the lease. The Company may renew the lease upon 365 days’ notice to the lessor for five additional one-year terms, provided that the Company is not in default at the time of its request. Significant terms of the lease for Building 4 include annual rent for the first year of the lease of $30.05 per square foot of rentable area with annual rent increases of 2% of the rent paid for the preceding lease year. If the Company exercises its option to cause the construction of Building 5, the term of the lease will reset to 15 years from the date the Company begins paying rent for Building 5. The Company will begin to capitalize costs associated with the construction of Building 4 when construction has commenced.

The Company also has $12,932 of non-cancellable contractual commitments as of December 31, 2016 related to the purchase of software and maintenance. These commitments are not accrued in the consolidated balance sheet of the Company.

Legal Contingencies

The Company may become a party to a variety of legal proceedings that arise in the normal course of business. While the results of such normal course legal proceedings cannot be predicted with certainty, management believes, based on current knowledge, that the final outcome of any matters will not have a material adverse effect on the Company’s business, financial position, results of operations or cash flows.

Stock-based Compensation

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

10. Stock-Based Compensation

Employee Stock-based Compensation Plan

The Company maintains the Amended and Restated Benefitfocus.com, Inc. 2000 Stock Option Plan (the “2000 Plan”) and the Benefitfocus.com, Inc. 2012 Stock Plan, as amended (the “2012 Plan”), pursuant to which the Company has reserved 4,243,675 shares of its common stock for issuance to its employees, directors and non-employee third parties. The 2012 Plan, effective on January 31, 2012, serves as the successor to the 2000 Plan and permits the granting of incentive stock options, non-statutory stock options, stock bonuses, stock purchase rights, stock appreciation rights, and restricted stock units and awards. No new awards can be issued under the 2000 Plan after the effective date of the 2012 Plan. Outstanding awards under the 2000 Plan continue to be subject to the terms and conditions of the 2000 Plan. Shares available for grant under the 2000 Plan, which were reserved but not issued or subject to outstanding awards under the 2000 Plan as of the effective date, were added to the reserves of the 2012 Plan. As of December 31, 2016, the Company had 808,059 shares allocated to the 2012 Plan, but not yet issued.

Stock options are granted at exercise prices not less than the estimated fair market value of the Company’s common stock at the date of grant. The grant date value of restricted stock units is equal to the closing price of the Company’s stock on the date of grant, or, if not a trading day, the closing price of the previous trading day. Generally, the Company issues previously unissued shares for the exercise of stock options or exchange of restricted stock units; however, previously acquired shares may be reissued to satisfy future issuances. The options and restricted stock unit awards typically vest over a four-year period. The options expire 10 years from the grant date. Compensation expense for the fair value of the stock-based awards at their grant date is recognized ratably over the vesting period.

The Company has issued two types of awards under these plans: stock options and restricted stock units. Stock options were not issued in 2016, 2015 or 2014. The following table sets forth the number of awards outstanding for each award type is as follows:

	Outstanding at December 31,
Award type	2016		2015		2014
Stock options		727,559		1,684,843		2,382,881
Restricted stock units		1,467,811		1,017,450		720,370

Compensation expense related to stock-based awards is included in the following line items in the accompanying consolidated statements of operations and comprehensive loss for the years ended December 31:

	2016		2015		2014
Cost of revenue	$	2,798	$	1,950	$	986
Sales and marketing		3,213		2,861		1,395
Research and development		4,532		2,399		1,376
General and administrative		7,545		3,244		1,831
	$	18,088	$	10,454	$	5,588

The total compensation cost related to non-vested awards not yet recognized as of December 31, 2016 was $31,151 and will be recognized over a weighted-average period of approximately 2.46 years.

Restricted Stock Units

During 2016, the Company granted restricted stock units under the 2012 Plan. Restricted stock units granted to employees vest in equal annual installments generally over 4 years from the grant date. The fair value of the stock at the time of grant is amortized based on a straight-line basis over the vesting period.

Included in the grants of 2016 restricted stock units are performance restricted stock units for which vesting is contingent upon meeting various financial targets to support growth initiatives. The Company granted 252,167 performance restricted stock units to officers and certain employees with an aggregate grant-date fair value of $7,871. Vesting is contingent upon meeting various financial targets to support growth initiatives through December 31, 2017. The actual number of shares issued upon vesting could range from 0% to 100%. Additionally, the Company granted 26,376 performance restricted stock units to officers and certain employees with an aggregate grant-date fair value of $875. The awards were granted in lieu of a portion of the target cash bonus that would otherwise be payable under the Company’s Management Incentive Bonus Program for the calendar year ended 2016. The awards vest upon achievement of annual financial targets for 2016. The actual number of shares to be issued upon vesting is estimated to be 95% of the number granted. As of December 31, 2016, there were 291,525 performance restricted stock units outstanding with a weighted average grant-date fair value of $32.59 per unit.

The summary of unvested restricted stock units is as follows:

	Restricted stock units			Weighted average grant date fair value
Unvested at December 31, 2015		1,017,450		$	36.90
Granted		1,012,763			33.79
Forfeited		(266,862	)		36.53
Vested		(295,540	)		36.94
Unvested at December 31, 2016		1,467,811		$	34.33

As of December 31, 2016, the number and intrinsic value of restricted stock units expected to vest was 1,282,106 and $38,079, respectively. The aggregate fair value of restricted stock units vested during the year ended December 31, 2016, 2015 and 2014 was $10,311, $6,261 and $661, respectively.

Stock options

The following is a summary of the option activity for the year ended December 31, 2016:

	Number of Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding balance at December 31, 2015		1,684,843		$	7.66
Granted		-			-
Exercised		(944,706	)		7.27
Forfeited		(12,578	)		12.32
Outstanding balance at December 31, 2016		727,559		$	8.09		3.1	$	15,723
Exercisable at December 31, 2016		720,053		$	8.03		3.1	$	15,601
Vested and expected to vest at December 31, 2016		727,548		$	8.09		3.1	$	15,722

The aggregate intrinsic value of employee options exercised during the years ended December 31, 2016, 2015, and 2014 was $21,117, $18,873 and $23,397, respectively.

No stock options were granted during the years ended December 31, 2016, 2015 and 2014.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Stockholders' Deficit

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Stockholders' Deficit

11. Stockholders’ Deficit

Preferred stock

The Company has 5,000,000 shares of preferred stock authorized all of which is undesignated.

Common Stock

The holders of common stock are entitled to one vote for each share. The voting, dividend and liquidation rights of the holders of common stock are subject to and qualified by the rights, powers and preferences of the holders of preferred stock.

At the Company’s annual stockholder meeting held in June 2016, the Company’s stockholders approved the Benefitfocus, Inc. 2016 Employee Stock Purchase Plan (“ESPP”) pursuant to which 150,000 shares of the Company’s common stock are available for purchase by its employees (and employees of its subsidiaries) who meet certain criteria. The Company’s board of directors approved the ESPP in March 2016. Under the ESPP, eligible employees may purchase the Company’s common stock through accumulated payroll deductions. Options to purchase shares are granted twice yearly on or about January 1 and July 1 and exercisable on or about the succeeding June 30 and December 31, respectively, of each year. Shares are purchased at purchase prices equal to 95% of the fair market value of the Company’s common stock at the purchase date. No participant may purchase more than $12 worth of the Company’s common stock in a six-month offering period. The ESPP's initial purchase period began in July 2016. As of December 31, 2016, contributions to purchase 3,964 shares had been received but not yet exercised. The number of shares of common stock reserved for issuance pursuant to the ESPP was 150,000 as of December 31, 2016.

At December 31, 2016, the Company had reserved a total of 3,734,242 of its authorized 50,000,000 shares of common stock for future issuance as follows:

Restricted stock units			1,467,811
Outstanding stock options			727,559
Warrant to purchase common stock			580,813
Available for future issuance under stock award plans			808,059
Available for future issuance under ESPP			150,000
Total common shares reserved for future issuance			3,734,242

On February 24, 2015 and in conjunction with the amendment to the commercial contract described in Note 15, the Company entered into a Securities Purchase Agreement to sell shares of its common stock to Mercer, a customer of the Company. Pursuant to the agreement, on the same date, the Company sold 2,817,526 shares of its common stock to Mercer for $26.50 per share or an aggregate of $74,664. At the same time, the Company also issued Mercer a warrant to purchase up to an additional 580,813 shares of its common stock for $26.50 per share at any time during the 30-month term of the warrant. The agreement, among other things, includes certain standstill provisions and prevents Mercer from disposing of its shares of Company common stock until the earlier of December 31, 2017, the expiration or termination of the Mercer Exchange Software as a Service Agreement, as amended between the Company and Mercer Health & Benefits, LLC, the date on which Mercer and its affiliates own less than 75% of the shares it purchased pursuant to the Securities Purchase Agreement, and the date on which Mercer and its affiliates own less than 5% of the outstanding common stock of the Company. The Company received all of the proceeds from this sale of shares and is using the proceeds for working capital and other general corporate purposes.

The Stock Purchase Agreement, warrant agreement and amended commercial contract are considered part of a single arrangement and accounted for in accordance with the multiple-element arrangement guidance outlined in ASC 605-25, Revenue: Multiple-Element Arrangements. The aggregate consideration from the arrangement was allocated to the units of accounting in the arrangement based on their estimated relative selling price, which resulted in $74,331 of consideration being allocated to common stock and warrant net of issuance costs.

During 2009, in connection with a new five-year contract executed with a major customer, the Company issued a warrant to the customer for the right to purchase 500,000 shares of common stock at $5.48 per share. The warrant was issued from the incentive stock option pool of shares approved by the Company’s board of directors and had a term of 10 years. The customer was originally entitled to exercise the warrant in its entirety in 9.5 years. Earlier exercise rights for all or part of the warrants are triggered under certain conditions, the most relevant of which are, on or after the third anniversary date of the issuance date if an IPO has occurred and immediately prior to the closing of a defined Corporate Transaction. In the event the customer cancelled the contract prior to the end of the five-year term, one half of the warrants would have been forfeited. In March 2013, the Company made this warrant fully exercisable. In March 2014, the customer exercised the warrant through a cashless exercise in accordance with the warrant’s terms. The Company issued 455,521 shares to satisfy its obligation under the warrant.

The Company used an option pricing model to determine the fair value of the common stock warrant. Significant inputs included an estimate of the fair value of the Company’s common stock, the remaining contractual life of the warrant, an estimate of the probability and timing of a liquidity event, a risk-free rate of interest and an estimate of the Company’s stock volatility using the volatilities of guideline peer companies. The value of the exercisable portion of the warrant is not dependent on the customer’s fulfillment of the contract and was measured on the issuance date, with the total fair value at issuance being recognized as a reduction to revenue over the contract period on the straight line basis. The remaining half of the warrant that was dependent on contract fulfillment by the customer was re-measured each quarter, with the resulting increment or decrement in value recognized as a revenue reduction on the straight line basis beginning in the quarter of the revaluation through the end of the contract. The related reduction of revenue during the year ended December 31, 2014 was $744. As of October 31, 2014, the fair value of the warrant had been fully recognized.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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+ Details

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	12. Employee Benefit Plan The Company maintains a qualified defined contribution plan under Section 401(k) of the U.S. Internal Revenue Code (the “401(k) Plan”) covering substantially all employees. Employees are eligible to participate in the 401(k) Plan after one day of service and upon attainment of age 21, and may elect to defer an amount or percentage of their annual compensation up to amounts prescribed by law. The Company makes discretionary matching contributions to employee plan accounts. During each of the years ended December 31, 2016, 2015 and 2014, the Company matched 50% of the employees’ contribution, with the match limited to 3% of qualifying compensation. Employee vesting in matching company contributions occurs at a rate of 20% per year after achieving two years of service. Starting in 2014, employees vesting in company contributions began after one year of service. During the years ended December 31, 2016, 2015, and 2014, employer matching contributions were $2,649, $2,570 and $2,083, respectively.

Income Taxes

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Income Taxes

13. Income Taxes

The Company files income tax returns in the U.S. for federal and various state jurisdictions. The Company is subject to U.S. federal income tax examination for calendar tax years 2009 through 2015 as well as state income tax examinations for various years depending on statutes of limitations of those jurisdictions.

The following summarizes the components of income tax expense for the years ended December 31:

Current:	2016		2015		2014
Federal	$	-	$	-	$	-
State and local		17		25		25
Total current expense	$	17	$	25	$	25
Deferred:
Federal	$	-	$	-	$	-
State and local		-		-		-
Total deferred taxes	$	-	$	-	$	-

Reconciliation between the effect of applying the federal statutory rate and the effective income tax rate used to calculate the Company’s income tax provision is as follows for the years ended December 31:

	2016			2015			2014
Federal statutory rate		34.0	%		34.0	%		34.0	%
Effect of:
State income taxes, net of federal benefit		6.0	%		6.0	%		4.8	%
Change in tax rates		2.6	%		1.7	%		0.4	%
State tax credits		4.1	%		2.5	%		0.4	%
Change in valuation allowance		(46.4	%)		(42.9	%)		(39.1	%)
Uncertain tax positions		0.0	%		0.0	%		0.0	%
Stock-based compensation		(0.1	%)		0.0	%		(0.4	%)
Other permanent items		(0.2	%)		(0.7	%)		(0.1	%)
Deferred true-up		0.0	%		(0.6	%)		0.0	%
Income tax provision effective rate		0.0	%		0.0	%		0.0	%

The significant components of the Company’s deferred tax asset and liability were as follows as of December 31,

	2016			2015
Deferred tax assets relating to:
Net operating loss carryforwards	$	65,467		$	43,322
Deferred revenue		19,255			26,563
Commissions and incentive accrual		1,563			2,777
Deferred rent		733			962
State tax credits		6,348			4,727
Stock-based compensation		5,199			2,952
Compensation and other accruals		5,222			5,099
Total gross deferred tax assets		103,787			86,402
Deferred tax liabilities
Property and equipment and intangible assets	$	(578	)	$	(1,087	)
Total gross deferred tax liabilities		(578	)		(1,087	)
Deferred tax assets less liabilities		103,209			85,315
Less: valuation allowance		(103,209	)		(85,315	)
Net deferred tax asset (liability)	$	-		$	-

As of December 31, 2016 and 2015, the Company’s gross deferred tax was reduced by a valuation allowance of $103,209 and $85,315, respectively.

The valuation allowance increased by $17,894 and $26,465 during the years ended December 31, 2016 and 2015, respectively. The valuation allowance increase resulted primarily from changes in the deferred tax assets related to the net operating loss carryforwards and deferred revenue.

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based upon the level of historical taxable income and projections for future taxable income over the periods in which the deferred tax assets are deductible, management believes it is more likely than not that the Company will not realize the benefits of these deductible differences in the future. In recognition of this risk, the Company has provided a full valuation allowance on the deferred tax assets relating to net operating loss carryforwards. The Company's Federal and state net operating losses include excess tax benefits related to deductions from the exercise of nonqualified stock options. The tax benefit of these deductions has not been recognized in deferred tax assets. If utilized, $21,632 of benefits from these deductions will be recorded as adjustments to taxes payable and additional paid in capital.

Net operating loss carryforwards for federal income tax purposes were approximately $183,528 and $123,305 at December 31, 2016 and 2015, respectively. State net operating loss carryforwards were $176,389 and $127,114 at December 31, 2016 and 2015, respectively. The federal net operating loss carryforwards will expire at various dates beginning in 2022 through 2034, if not utilized. Net operating loss carryforwards and credit carryforwards reflected above may be limited due to historical and future ownership changes.

South Carolina jobs tax credit and headquarters tax credit carryovers of $10,055 and $7,598 were available at December 31, 2016 and 2015, respectively. Headquarters credits are expected to be used to offset future state income tax license fees. The credits expire in various amounts during 2020 through 2028.

The Company follows FASB ASC 740-10 for accounting for unrecognized tax benefits. As of December 31, 2016, the Company had gross unrecognized tax benefits of $437.

A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows for the years ended December 31:

	2016		2015		2014
Balance at beginning of year	$	437	$	437	$	437
Additions based on tax positions related to the current year		-		-		-
Additions for tax positions in prior years		-		-		-
Reductions for tax positions of prior years		-		-		-
Reductions for tax positions due to lapse of statute		-		-		-
Settlements		-		-		-
Balance at end of year	$	437	$	437	$	437

At December 31, 2016 and 2015, none of the $437 liabilities for unrecognized tax benefits could impact the Company’s effective tax rate, if recognized. The Company does not expect the unrecognized tax benefits to change within the next twelve months.

The Company is subject to U.S. income taxes, as well as various taxes state and local jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state, and local income tax examinations by tax authorities for years before the tax year ended December 31, 2013, although carryforward attributes that were generated prior to 2013 may still be adjusted upon examination by the taxing authorities if they either have been used or will be used in a future period.

Segments and Geographic Information

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Segments and Geographic Information

14. Segments and Geographic Information

Operating segments are defined as components of an enterprise for which discrete financial information is available that is evaluated regularly by the chief operating decision maker (“CODM”) for purposes of allocating resources and evaluating financial performance. The Company’s CODM, the Chief Executive Officer, reviews financial information presented on a consolidated basis, accompanied by information about operating segments, for purposes of allocating resources and evaluating financial performance.

The Company’s reportable segments are based on the type of customer. The Company determined its operating segments to be: Employer, which derives substantially all of its revenue from customers that use the Company’s services for the provision of benefits to their employees, and administrators acting on behalf of employers; and Carrier, which derives substantially all of its revenue from insurance companies that provide coverage at their own risk.

Segments are evaluated based on gross profit. The Company does not allocate interest income, interest expense or income tax expense by segment. Accordingly, the Company does not report such information. Additionally, Employer and Carrier segments share the majority of the Company’s assets. Therefore, no segment asset information is reported.

	Year Ended December 31,
	2016		2015		2014
Revenue from external customers by segment:
Employer	$	140,522	$	94,842	$	62,016
Carrier		92,813		90,301		75,404
Total net revenue from external customers	$	233,335	$	185,143	$	137,420
Depreciation and amortization by segment:
Employer	$	7,950	$	6,024	$	4,392
Carrier		5,123		5,640		5,101
Total depreciation and amortization	$	13,073	$	11,664	$	9,493
Gross profit by segment
Employer	$	53,031	$	33,655	$	16,186
Carrier		59,623		48,637		33,764
Total gross profit by segment	$	112,654	$	82,292	$	49,950

Substantially all assets were held and all revenue was generated in the United States during the years ended December 31, 2016, 2015 and 2014.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

+ Details

Related Parties

12 Months Ended

Dec. 31, 2016

Related Parties

15. Related Parties

Related Party Leasing Arrangements

The Company leases its office space at its Charleston, South Carolina headquarters campus under the terms of three non-cancellable leases from entities with which two of the Company’s directors, significant stockholders, and executives are affiliated. The Company’s headquarters building lease and an additional building lease are accounted for as build-to-suit leases and recorded as financing obligations in the Consolidated Balance Sheets. The remaining lease, also for office space, was accounted for as an operating lease during 2016 and periods prior. As described in Note 9, the Company executed an amendment to each of the three lease agreements on December 12, 2016. These amendments extended the term of the leases to December 31, 2031. The leases contain options to renew the leases for five additional years. The arrangements provide for 3.0% fixed annual rent increases. In addition to extending the lease term, the amendment to the lease for the Company’s Customer Success Center, a 145,800 square foot building on its campus, which commenced January 1, 2015:

•

extended from December 13, 2016 to December 31, 2018 the term of an option that allows the Company to require the lessor to build a two-story building, including potentially for a welcome center of approximately 18,500 square feet on its campus (“Building 5”) for the Company to lease,

•

waived certain accrued and future carrying costs and termination fees payable to the lessor by the Company under the existing option in the amount of $1,223, and

•

reduced the annual rent increases for the Customer Success Center from 3% to 2% contingent upon construction of Building 4 described below.

On December 12, 2016 and in conjunction with the lease amendments, the Company also executed a cancellable lease agreement with an entity which two of the Company’s directors, significant stockholders, and executives are affiliated. Pursuant to the agreement the lessor will construct a building of approximately 145,800 square feet on its campus for the Company to accommodate anticipated future growth (“Building 4”). The target commencement date of the lease is July 1, 2019 with a term of 15 years. Under the terms of the lease, the Company agrees to commence construction on or about April 1, 2018, but can terminate the lease prior to that time, subject to payment of reasonable, documented, and agreed-to out-of-pocket costs with respect to the lease and building to date. If the Company delays beginning construction past December 31, 2018, the lessor may terminate the lease. The Company may renew the lease upon 365 days’ notice to the lessor for five additional one-year terms, provided that the Company is not in default at the time of its request. Significant terms of the lease for Building 4 include annual rent for the first year of the lease of $30.05 per square foot of rentable area with annual rent increases of 2% of the rent paid for the preceding lease year. If the Company exercises its option to cause the construction of Building 5, the term of the lease will reset to 15 years from the date the Company begins paying rent for Building 5.

In connection with the cancellable lease for Building 4 and the option for Building 5 described above, the leasing entity meets the criteria to be a variable interest entity. The Company is not the primary beneficiary of the leasing entity, as the activities that are most significant to the leasing entity’s economic performance, consisting of financing, development, management, and sale of office facilities, are directed by another party. As such, the Company is not required to consolidate the entity as the primary beneficiary. The lease terms would not include a residual value guarantee, fixed-price purchase option, or similar feature that would obligate the Company to absorb decreases in value or would entitle the Company to participate in increases in the value of Buildings 4 or 5. The Company has not and does not intend to provide financial or other support to the leasing entity. The Company’s maximum exposure, assuming the exercise of the option, would consist of rent to be paid over the 15-year term of the lease, construction cost overruns, agreed upon pre-construction costs incurred prior to termination and operating expenses in excess of a certain threshold. The Company’s maximum exposure currently cannot be quantified.

Payments related to these agreements were $10,417, $11,940, and $5,634 for the years ended December 31, 2016, 2015 and 2014, respectively. Amounts due to the related parties were $854 and $1,116 as of December 31, 2016 and 2015, respectively. Amounts due to the related parties were recorded as $854 in “Accrued Expenses” as of December 31, 2016 and $628 in “Accounts Payable” and $488 in “Accrued Expenses” as of December 31, 2015.

Related Party Travel Expenses

The Company utilizes the services of a private air transportation company that is owned and controlled by one of the Company’s significant stockholders and executives. Expenses related to these companies were $80, $127 and $438 for the years ended December 31, 2016, 2015 and 2014, respectively, and consist of air travel related to the operations of the business. No amounts were due to the related party as of December 31, 2016 and 2015.

Related Party Revenues

As disclosed in Note 11, the Company entered into a Stock Purchase Agreement with Mercer, a customer, on February 24, 2015. As a result of this transaction, Mercer became a related party by virtue of beneficially owning more than 10% of the voting interest of the Company. At the same time, the Company entered into an amendment of its commercial contract with Mercer. The amendment to the commercial contract, among other things, expanded certain terms and conditions of the existing relationship between the Company and Mercer and its affiliates. Revenue from Mercer was $26,720 and $13,552 for the years ended December 31, 2016 and 2015, respectively, and was reflected in “Revenues,” within the accompanying statements of operations. The amounts due from Mercer were $4,626 and $2,082 as of December 31, 2016 and 2015, respectively. The amount of deferred revenue associated with Mercer was $7,683 and $9,128 as of December 31, 2016 and 2015, respectively, and was reflected in the balances of deferred revenue in the consolidated balance sheets.

Related Party Revolving Line of Credit

As disclosed in Note 8, the Company amended its revolving line of credit agreement in 2016. As part of the amendment in October 2016, Goldman Sachs Lending Partners, LLC was added to the lending syndicate. Goldman Sachs Lending Partners, LLC is an affiliate of The Goldman Sachs Group, Inc., as are the Goldman Sachs funds that owned approximately 20.5% of the Company’s outstanding common stock as of December 31, 2016. Goldman Sachs Lending Partners, LLC committed $10,000 to the revolving commitment and participates in amounts borrowed under the credit facility at a rate of approximately 10.5%. Accordingly, approximately $4,226 of the $40,246 outstanding under the revolving line of credit as of December 31, 2016 was due to Goldman Sachs Lending Partners, LLC.

Selected Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (unaudited)

16. Selected Quarterly Financial Data (unaudited)

The following tables set forth selected unaudited quarterly statements of operations data for each of the eight quarters in the years ended December 31, 2016 and 2015.

	Quarter Ended
	December 31,			September 30,			June 30,			March 31,			December 31,			September 30,			June 30,			March 31,
	2016			2016			2016			2016			2015			2015			2015			2015
Consolidated Statements of Operations Data:
Revenue	$	62,647		$	58,022		$	57,874		$	54,792		$	54,340		$	45,426		$	42,708		$	42,669
Gross profit		30,125			28,910			28,124			25,495			23,857			19,161			19,068			20,206
Total operating expenses		35,189			35,434			37,215			36,984			34,482			33,953			35,468			32,663
Operating loss		(5,064	)		(6,524	)		(9,091	)		(11,489	)		(10,625	)		(14,792	)		(16,400	)		(12,457	)
Net loss	$	(7,099	)	$	(8,603	)	$	(11,004	)	$	(13,352	)	$	(12,487	)	$	(16,664	)	$	(18,284	)	$	(14,649	)
Net loss per common share (a)	$	(0.24	)	$	(0.29	)	$	(0.37	)	$	(0.46	)	$	(0.43	)	$	(0.58	)	$	(0.64	)	$	(0.55	)
Weighted-average common shares outstanding--basic and diluted		30,030,164			29,651,230			29,459,341			29,213,198			29,120,171			28,847,493			28,633,992			26,745,444

(a)	Quarterly and year-to-date computations of per share amounts are made independently. Therefore, the sum of the per-share amounts for the quarters may not agree with per share amounts for the year.

The quarterly unaudited consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements included in this report and include all adjustments, consisting only of normal recurring adjustments, that we consider necessary for a fair presentation of such information when read in conjunction with our annual audited consolidated financial statements (as restated) and notes appearing in this report. The operating results for any quarter do not necessarily indicate the results for any subsequent period or for the entire fiscal year.

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	17. Subsequent Events Restricted Stock Units During January 2017, the Company granted 22,278 restricted stock units to employees with an aggregate grant date fair value of $668. These restricted stock units generally vest in equal annual installments generally over 4 years from the grant date. The Company amortizes the fair value of the stock subject to the restricted stock units at the time of grant on a straight-line basis over the period of vesting. During January 2017, stock option exercises and vesting of restricted stock units resulted in the issuance of 267,885 shares of common stock. Revolving Line of Credit In January 2017, the Company repaid $20,000 that was previously borrowed under the Senior Revolver.

Schedule II-Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2016

Valuation And Qualifying Accounts [Abstract]

Schedule II-Valuation and Qualifying Accounts

Schedule II—Valuation and Qualifying Accounts (in thousands)

	Balance at Beginning of Period		Additions Charged To Expense		Additions Charged Against Revenue		Deductions			Balance at End of Period
Allowance for doubtful accounts and returns:
Year Ended December 31, 2016	$	2,585	$	667	$	5,004	$	(3,661	)	$	4,595
Year Ended December 31, 2015	$	1,663	$	22	$	7,646	$	(6,746	)	$	2,585
Year Ended December 31, 2014	$	810	$	94	$	4,585	$	(3,826	)	$	1,663

	Balance at Beginning of Period		Additions Charged To Costs and Expenses (1)		Deductions		Balance at End of Period
Deferred tax asset valuation allowance:
Year Ended December 31, 2016	$	85,315	$	17,894	$	-	$	103,209
Year Ended December 31, 2015	$	58,850	$	26,465	$	-	$	85,315
Year Ended December 31, 2014	$	34,425	$	24,425	$	-	$	58,850
(1) Increase in valuation allowance is related to the generation of net operating losses and other deferred tax assets.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Principles of Consolidation

Use of Estimates

Revenue and Deferred Revenue

Cost of Revenue

Cash and Cash Equivalents

Marketable Securities

Concentrations of Credit Risk

No customer represented more than 10% of total revenue for the years ended December 31, 2015 and 2014.

Accounts Receivable and Allowance for Doubtful Accounts and Returns

Property and Equipment and Capitalized Software Development Costs

The estimated useful lives for significant property and equipment categories are generally as follows:

Buildings		30 years
Computers and related equipment		3-5 years
Purchased software and licenses		1-7 years
Developed software		3 years
Furniture and fixtures		7 years
Leasehold improvements		Lesser of estimated useful life of asset or lease term
Other equipment		5-12 years
Vehicles		5 years

Identifiable Intangible Assets

Impairment of Long-Lived Assets and Goodwill

Financing Obligations

Financing obligations also include liabilities for the purchase of licenses.

Sales Commissions

Sales commissions are generally expensed when the sales contract is executed by the customer.

Advertising

The Company expenses advertising costs as they are incurred. Direct advertising costs for the years ended December 31, 2016, 2015, and 2014 were $635, $435 and $394, respectively.

Comprehensive Loss

The Company’s net loss equals comprehensive loss for all periods presented.

Stock-Based Employee Compensation

Income Taxes

Basic and Diluted Net Loss per Common Share

Recent Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Estimated Useful Lives for Significant Property and Equipment

The estimated useful lives for significant property and equipment categories are generally as follows:

Buildings		30 years
Computers and related equipment		3-5 years
Purchased software and licenses		1-7 years
Developed software		3 years
Furniture and fixtures		7 years
Leasehold improvements		Lesser of estimated useful life of asset or lease term
Other equipment		5-12 years
Vehicles		5 years

Net Loss Per Common Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Common Share Equivalent Securities Excluded from Calculation of Weighted-Average Common Shares Outstanding

The following common share equivalent securities have been excluded from the calculation of weighted-average common shares outstanding because the effect is anti-dilutive for the periods presented:

	Year Ended December 31,
Anti-Dilutive Common Share Equivalents	2016		2015		2014
Redeemable convertible preferred stock:
Series A		-		-		-
Series B		-		-		-
Restricted stock units		1,467,811		1,017,450		720,370
Stock options		727,559		1,684,843		2,382,881
Warrant to purchase common stock		580,813		580,813		-
Employee Stock Purchase Plan		3,964		-		-
Total anti-dilutive common share equivalents		2,780,147		3,283,106		3,103,251

Basic and Diluted Net Loss per Common Share

Basic and diluted net loss per common share is calculated as follows:

	Year Ended December 31,
	2016			2015			2014
Numerator:
Net loss	$	(40,058	)	$	(62,084	)	$	(63,179	)
Net loss attributable to common stockholders	$	(40,058	)	$	(62,084	)	$	(63,179	)
Denominator:
Weighted-average common shares outstanding, basic and diluted		29,589,857			28,344,680			25,207,099
Net loss per common share, basic and diluted	$	(1.35	)	$	(2.19	)	$	(2.51	)

Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2016

Investments Debt And Equity Securities [Abstract]

Schedule of Marketable Securities

The following presents information about the Company’s marketable securities as of December 31:

	2016		2015
Aggregate cost basis and net carrying amount	$	2,007	$	40,448
Gross unrealized holding gains		-		1
Gross unrealized holding losses		-		(26	)
Aggregate fair value determined by Level 2 inputs	$	2,007	$	40,423

Investments In Unrealized Loss Position For Which Other-Than-Temporary Impairment not Recognized in Earnings

	2016		2015
Aggregate fair value of investments with unrealized losses ⁽¹⁾	$	-	$	27,070
Aggregate amount of unrealized losses	$	-	$	(26	)

(1)	Investments have been in a continuous loss position for less than 12 months

Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

	December 31, 2016
Description	Level 1		Level 2		Level 3		Total
Cash Equivalents:
Money market mutual funds ⁽¹⁾	$	51,285	$	-	$	-	$	51,285
Total assets	$	51,285	$	-	$	-	$	51,285

	December 31, 2015
Description	Level 1		Level 2		Level 3		Total
Cash Equivalents:
Money market mutual funds ⁽¹⁾	$	46,905	$	-	$	-	$	46,905
Total assets	$	46,905	$	-	$	-	$	46,905

(1)

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property Plant And Equipment [Abstract]

Property and Equipment

Property and equipment consists of the following as of December 31:

	2016			2015
Buildings, leased	$	48,558		$	29,291
Computers and related equipment		33,924			24,505
Purchased software and licenses		25,982			23,354
Developed software		26,142			20,900
Furniture and fixtures		6,668			6,651
Leasehold improvements		4,348			4,101
Other equipment		2,072			2,117
Vehicles		111			111
Construction in progress		319			412
Total property and equipment, at cost		148,124			111,442
Accumulated depreciation and amortization		(67,606	)		(56,405	)
Property and equipment, net	$	80,518		$	55,037

Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Acquisition-Related Intangible Assets

Information regarding the Company’s acquisition-related intangible assets is as follows:

	As of December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted- Average Remaining Useful Life (in years)
Trademarks	$	240	$	(240	)	$	-		-
Customer agreements		2,060		(1,652	)		408		1.6
Non-compete agreements		126		(126	)		-		-
Total	$	2,426	$	(2,018	)	$	408		1.6

	As of December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted- Average Remaining Useful Life (in years)
Trademarks	$	240	$	(240	)	$	-		-
Customer agreements		2,060		(1,395	)		665		2.6
Non-compete agreements		126		(126	)		-		-
Total	$	2,426	$	(1,761	)	$	665		2.6

Expected Amortization Expense for the Intangible Assets

As of December 31, 2016, expected amortization expense for the intangible assets for the remaining useful life was as follows:

2017	$	258
2018		150
Total	$	408

Commitment and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments And Contingencies Disclosure [Abstract]

Future Minimum Operating Lease Payments

Future minimum lease payments are as follows:

	Operating Leases
Year Ending December 31,
2017	$	1,345
2018		1,103
2019		1,117
2020		816
2021		773
Thereafter		9,131
Total minimum lease payments	$	14,285

Financing Obligations

Financing obligations are allocated as follows:

	As of December 31,
	2016			2015
Buildings, build-to-suit	$	31,326		$	30,494
Software and support		2,339			1,595
Total financing obligations	$	33,665		$	32,089
Less: current portion		(757	)		(1,577	)
Financing obligations, net of current portion	$	32,908		$	30,512

Future Minimum Lease Payments

Future minimum lease payments are as follows:

	Capital Leases			Financing Obligations
Year Ending December 31,
2017	$	4,935		$	7,071
2018		5,089			7,759
2019		4,981			6,859
2020		3,397			6,747
2021		2,941			6,949
Thereafter		34,726			82,054
Total minimum lease and financing obligation payments		56,069		$	117,439
Less: executory costs		(5,938	)
Less: imputed interest		(23,258	)
Less: current portion		(1,847	)
Capital lease obligations, net of current portion	$	25,026

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Number of Awards Outstanding

	Outstanding at December 31,
Award type	2016		2015		2014
Stock options		727,559		1,684,843		2,382,881
Restricted stock units		1,467,811		1,017,450		720,370

Compensation Expense Related to Stock Options

	2016		2015		2014
Cost of revenue	$	2,798	$	1,950	$	986
Sales and marketing		3,213		2,861		1,395
Research and development		4,532		2,399		1,376
General and administrative		7,545		3,244		1,831
	$	18,088	$	10,454	$	5,588

Summary of Unvested Restricted Stock Units Activity

The summary of unvested restricted stock units is as follows:

	Restricted stock units			Weighted average grant date fair value
Unvested at December 31, 2015		1,017,450		$	36.90
Granted		1,012,763			33.79
Forfeited		(266,862	)		36.53
Vested		(295,540	)		36.94
Unvested at December 31, 2016		1,467,811		$	34.33

Summary of Option Activity

The following is a summary of the option activity for the year ended December 31, 2016:

	Number of Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding balance at December 31, 2015		1,684,843		$	7.66
Granted		-			-
Exercised		(944,706	)		7.27
Forfeited		(12,578	)		12.32
Outstanding balance at December 31, 2016		727,559		$	8.09		3.1	$	15,723
Exercisable at December 31, 2016		720,053		$	8.03		3.1	$	15,601
Vested and expected to vest at December 31, 2016		727,548		$	8.09		3.1	$	15,722

Stockholders' Deficit (Tables)

12 Months Ended

Dec. 31, 2016

Equity [Abstract]

Shares of Common Stock Reserved for Future Issuance

At December 31, 2016, the Company had reserved a total of 3,734,242 of its authorized 50,000,000 shares of common stock for future issuance as follows:

Restricted stock units			1,467,811
Outstanding stock options			727,559
Warrant to purchase common stock			580,813
Available for future issuance under stock award plans			808,059
Available for future issuance under ESPP			150,000
Total common shares reserved for future issuance			3,734,242

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Summary of Components of Income Tax (Benefit) Expense

The following summarizes the components of income tax expense for the years ended December 31:

Current:	2016		2015		2014
Federal	$	-	$	-	$	-
State and local		17		25		25
Total current expense	$	17	$	25	$	25
Deferred:
Federal	$	-	$	-	$	-
State and local		-		-		-
Total deferred taxes	$	-	$	-	$	-

Reconciliation Between Effect of Applying Federal Statutory Rate and Effective Income Tax Rate Used to Calculate Income Tax Provision

	2016			2015			2014
Federal statutory rate		34.0	%		34.0	%		34.0	%
Effect of:
State income taxes, net of federal benefit		6.0	%		6.0	%		4.8	%
Change in tax rates		2.6	%		1.7	%		0.4	%
State tax credits		4.1	%		2.5	%		0.4	%
Change in valuation allowance		(46.4	%)		(42.9	%)		(39.1	%)
Uncertain tax positions		0.0	%		0.0	%		0.0	%
Stock-based compensation		(0.1	%)		0.0	%		(0.4	%)
Other permanent items		(0.2	%)		(0.7	%)		(0.1	%)
Deferred true-up		0.0	%		(0.6	%)		0.0	%
Income tax provision effective rate		0.0	%		0.0	%		0.0	%

Components of Deferred Tax Asset and Liability

The significant components of the Company’s deferred tax asset and liability were as follows as of December 31,

	2016			2015
Deferred tax assets relating to:
Net operating loss carryforwards	$	65,467		$	43,322
Deferred revenue		19,255			26,563
Commissions and incentive accrual		1,563			2,777
Deferred rent		733			962
State tax credits		6,348			4,727
Stock-based compensation		5,199			2,952
Compensation and other accruals		5,222			5,099
Total gross deferred tax assets		103,787			86,402
Deferred tax liabilities
Property and equipment and intangible assets	$	(578	)	$	(1,087	)
Total gross deferred tax liabilities		(578	)		(1,087	)
Deferred tax assets less liabilities		103,209			85,315
Less: valuation allowance		(103,209	)		(85,315	)
Net deferred tax asset (liability)	$	-		$	-

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows for the years ended December 31:

	2016		2015		2014
Balance at beginning of year	$	437	$	437	$	437
Additions based on tax positions related to the current year		-		-		-
Additions for tax positions in prior years		-		-		-
Reductions for tax positions of prior years		-		-		-
Reductions for tax positions due to lapse of statute		-		-		-
Settlements		-		-		-
Balance at end of year	$	437	$	437	$	437

Segments and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Segments and Geographic Information

	Year Ended December 31,
	2016		2015		2014
Revenue from external customers by segment:
Employer	$	140,522	$	94,842	$	62,016
Carrier		92,813		90,301		75,404
Total net revenue from external customers	$	233,335	$	185,143	$	137,420
Depreciation and amortization by segment:
Employer	$	7,950	$	6,024	$	4,392
Carrier		5,123		5,640		5,101
Total depreciation and amortization	$	13,073	$	11,664	$	9,493
Gross profit by segment
Employer	$	53,031	$	33,655	$	16,186
Carrier		59,623		48,637		33,764
Total gross profit by segment	$	112,654	$	82,292	$	49,950

Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Statements of Operations Data

The following tables set forth selected unaudited quarterly statements of operations data for each of the eight quarters in the years ended December 31, 2016 and 2015.

	Quarter Ended
	December 31,			September 30,			June 30,			March 31,			December 31,			September 30,			June 30,			March 31,
	2016			2016			2016			2016			2015			2015			2015			2015
Consolidated Statements of Operations Data:
Revenue	$	62,647		$	58,022		$	57,874		$	54,792		$	54,340		$	45,426		$	42,708		$	42,669
Gross profit		30,125			28,910			28,124			25,495			23,857			19,161			19,068			20,206
Total operating expenses		35,189			35,434			37,215			36,984			34,482			33,953			35,468			32,663
Operating loss		(5,064	)		(6,524	)		(9,091	)		(11,489	)		(10,625	)		(14,792	)		(16,400	)		(12,457	)
Net loss	$	(7,099	)	$	(8,603	)	$	(11,004	)	$	(13,352	)	$	(12,487	)	$	(16,664	)	$	(18,284	)	$	(14,649	)
Net loss per common share (a)	$	(0.24	)	$	(0.29	)	$	(0.37	)	$	(0.46	)	$	(0.43	)	$	(0.58	)	$	(0.64	)	$	(0.55	)
Weighted-average common shares outstanding--basic and diluted		30,030,164			29,651,230			29,459,341			29,213,198			29,120,171			28,847,493			28,633,992			26,745,444

(a)	Quarterly and year-to-date computations of per share amounts are made independently. Therefore, the sum of the per-share amounts for the quarters may not agree with per share amounts for the year.

Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Thousands

1 Months Ended

3 Months Ended

12 Months Ended

Jan. 31, 2015

Dec. 31, 2016

USD ($)

$ / shares

Sep. 30, 2016

USD ($)

$ / shares

Jun. 30, 2016

USD ($)

$ / shares

Mar. 31, 2016

USD ($)

$ / shares

Dec. 31, 2015

USD ($)

$ / shares

Sep. 30, 2015

USD ($)

$ / shares

Jun. 30, 2015

USD ($)

$ / shares

Mar. 31, 2015

USD ($)

$ / shares

Dec. 31, 2016

USD ($)

Segment

$ / shares

Dec. 31, 2015

USD ($)

Customer

$ / shares

Dec. 31, 2014

USD ($)

Customer

$ / shares

Summary of Significant Accounting Policies [Line Items]

Revenue from implementation services

$ 2,083

$ 2,401

Net loss

$ (7,099)

$ (8,603)

$ (11,004)

$ (13,352)

$ (12,487)

$ (16,664)

$ (18,284)

$ (14,649)

$ (40,058)

$ (62,084)

$ (63,179)

Net loss per common share, basic and diluted | $ / shares

$ (0.24)

^[1]

$ (0.29)

^[1]

$ (0.37)

^[1]

$ (0.46)

^[1]

$ (0.43)

^[1]

$ (0.58)

^[1]

$ (0.64)

^[1]

$ (0.55)

^[1]

$ (1.35)

$ (2.19)

$ (2.51)

Revenue

$ 62,647

$ 58,022

$ 57,874

$ 54,792

$ 54,340

$ 45,426

$ 42,708

$ 42,669

$ 233,335

$ 185,143

$ 137,420

Allowance for doubtful accounts

691

$ 691

Finite lived intangibles, useful life

1 year 7 months 6 days

Number of operating segments | Segment

Advertising costs

$ 635

435

$ 394

Capitalized Software Development Costs

Summary of Significant Accounting Policies [Line Items]

Useful lives for property and equipment

3 years

Allowance for Returns

Summary of Significant Accounting Policies [Line Items]

Allowance for returns

$ 3,904

$ 2,553

$ 3,904

$ 2,553

Customer Concentration Risk | Accounts Receivable | North Carolina State Health Plan

Summary of Significant Accounting Policies [Line Items]

Concentration risk, percentage

13.00%

22.00%

Customer Concentration Risk | Accounts Receivable | Mercer

Summary of Significant Accounting Policies [Line Items]

Concentration risk, percentage

14.00%

Customer Concentration Risk | Total Revenue

Summary of Significant Accounting Policies [Line Items]

Number of customers exceeded 10% of total revenue | Customer

Customer Concentration Risk | Total Revenue | Mercer

Summary of Significant Accounting Policies [Line Items]

Concentration risk, percentage

11.00%

Employer

Summary of Significant Accounting Policies [Line Items]

Revenue

$ 140,522

$ 94,842

$ 62,016

Carrier

Summary of Significant Accounting Policies [Line Items]

Revenue

$ 92,813

90,301

$ 75,404

Change in Customer Relationship Period

Summary of Significant Accounting Policies [Line Items]

Loss before income taxes

6,207

Net loss

$ (6,207)

Net loss per common share, basic and diluted | $ / shares

$ (0.22)

Change in Customer Relationship Period | Employer

Summary of Significant Accounting Policies [Line Items]

Revenue

$ 1,137

Change in Customer Relationship Period | Carrier

Summary of Significant Accounting Policies [Line Items]

Revenue

$ 5,070

Maximum

Summary of Significant Accounting Policies [Line Items]

Deferred revenue recognition period

10 years

Cash equivalents maturity period

3 months

Highly rated marketable securities

2 years

Weighted average maturity of portfolio of investments

9 months

Minimum

Summary of Significant Accounting Policies [Line Items]

Deferred revenue recognition period

7 years

[1]	Quarterly and year-to-date computations of per share amounts are made independently. Therefore, the sum of the per-share amounts for the quarters may not agree with per share amounts for the year.

Estimated Useful Lives for Significant Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2016
Buildings
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	30 years
Developed software
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	3 years
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	7 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	Lesser of estimated useful life of asset or lease term
Vehicles
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	5 years
Minimum \| Computers and Related Equipment
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	3 years
Minimum \| Purchased Software and Licenses
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	1 year
Minimum \| Other Equipment
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	5 years
Maximum \| Computers and Related Equipment
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	5 years
Maximum \| Purchased Software and Licenses
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	7 years
Maximum \| Other Equipment
Property, Plant and Equipment [Line Items]
Useful lives for property and equipment	12 years

Common Share Equivalents Securities Excluded From Calculation of Weighted Average Common Share Outstanding (Detail) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	2,780,147	3,283,106	3,103,251
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	1,467,811	1,017,450	720,370
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	727,559	1,684,843	2,382,881
Warrant to Purchase Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	580,813	580,813	0
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	3,964	0	0
Series A Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	0	0	0
Series B Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	0	0	0

Basic and Diluted Net Loss per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Numerator:

Net loss

$ (7,099)

$ (8,603)

$ (11,004)

$ (13,352)

$ (12,487)

$ (16,664)

$ (18,284)

$ (14,649)

$ (40,058)

$ (62,084)

$ (63,179)

Net loss attributable to common stockholders

$ (40,058)

$ (62,084)

$ (63,179)

Denominator:

Weighted-average common shares outstanding, basic and diluted

30,030,164

29,651,230

29,459,341

29,213,198

29,120,171

28,847,493

28,633,992

26,745,444

29,589,857

28,344,680

25,207,099

Net loss per common share, basic and diluted

$ (0.24)

^[1]

$ (0.29)

^[1]

$ (0.37)

^[1]

$ (0.46)

^[1]

$ (0.43)

^[1]

$ (0.58)

^[1]

$ (0.64)

^[1]

$ (0.55)

^[1]

$ (1.35)

$ (2.19)

$ (2.51)

[1]	Quarterly and year-to-date computations of per share amounts are made independently. Therefore, the sum of the per-share amounts for the quarters may not agree with per share amounts for the year.

Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments Debt And Equity Securities [Abstract]
Aggregate cost basis and net carrying amount	$ 2,007	$ 40,448
Gross unrealized holding gains	0	1
Gross unrealized holding losses	0	(26)
Aggregate fair value determined by Level 2 inputs	$ 2,007	$ 40,423

Unrealized Loss Position of Investments Other-Than-Temporary Impairment not Recognized in Earnings (Detail) - USD ($)
$ in Thousands

Dec. 31, 2016

Dec. 31, 2015

Investments Debt And Equity Securities [Abstract]

Aggregate fair value of investments with unrealized losses

^[1]

$ 0

$ 27,070

Aggregate amount of unrealized losses

$ 0

$ (26)

[1]	Investments have been in a continuous loss position for less than 12 months

Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands

Dec. 31, 2016

Dec. 31, 2015

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total assets

$ 51,285

$ 46,905

Money market mutual funds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash Equivalents

^[1]

51,285

46,905

Level 1

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total assets

51,285

46,905

Level 1 | Money market mutual funds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash Equivalents

^[1]

51,285

46,905

Level 2

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total assets

Level 2 | Money market mutual funds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash Equivalents

^[1]

Level 3

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total assets

Level 3 | Money market mutual funds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash Equivalents

^[1]

$ 0

[1]

Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 148,124	$ 111,442
Accumulated depreciation and amortization	(67,606)	(56,405)
Property and equipment, net	80,518	55,037
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,558	29,291
Computers and Related Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	33,924	24,505
Purchased Software and Licenses
Property, Plant and Equipment [Line Items]
Property and equipment, gross	25,982	23,354
Developed software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	26,142	20,900
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,668	6,651
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,348	4,101
Other Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,072	2,117
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	111	111
Construction in progress, build-to-suit
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 319	$ 412

Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 13,073	$ 11,664	$ 9,493
Fixed assets acquired under capital lease	35,761	9,131
Accumulated depreciation of assets under capital leases	5,194	3,126
Capitalized software cost gross	5,242	2,503
Amortization of capitalized software cost	2,857	2,587	2,257
Capitalized software cost net	6,435	4,049
Property and Equipment
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 12,816	$ 11,378	$ 9,188

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 1,634,000	$ 1,634,000
Goodwill gross carrying amount	3,304,000	3,304,000
Goodwill accumulated impairment losses	(1,670,000)	(1,670,000)
Amortization expense related to acquisition of intangible assets	257,000	286,000	$ 305,000
Impairment of intangible assets	$ 0	$ 0	$ 0

Acquisition-Related Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,426	$ 2,426
Accumulated Amortization	(2,018)	(1,761)
Net Carrying Amount	$ 408	$ 665
Weighted- Average Remaining Useful Life (in years)	1 year 7 months 6 days	2 years 7 months 6 days
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 240	$ 240
Accumulated Amortization	(240)	(240)
Net Carrying Amount	$ 0	$ 0
Weighted- Average Remaining Useful Life (in years)	0 years	0 years
Customer Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,060	$ 2,060
Accumulated Amortization	(1,652)	(1,395)
Net Carrying Amount	$ 408	$ 665
Weighted- Average Remaining Useful Life (in years)	1 year 7 months 6 days	2 years 7 months 6 days
Non-compete Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 126	$ 126
Accumulated Amortization	(126)	(126)
Net Carrying Amount	$ 0	$ 0
Weighted- Average Remaining Useful Life (in years)	0 years	0 years

Expected Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
2017	$ 258
2018	150
Net Carrying Amount	$ 408	$ 665

Revolving Line of Credit - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2016	Feb. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 27, 2013
Line Of Credit Facility [Line Items]
Proceeds from line of credit borrowing			$ 84,000,000	$ 57,492,000	$ 14,000,000
Payments on revolving line of credit			74,000,000	44,903,000	$ 2,100,000
Hardware And Software
Line Of Credit Facility [Line Items]
Proceeds from line of credit borrowing			84,000,000	39,246,000
Payments on revolving line of credit			$ 74,000,000	$ 27,246,000
Revolving Line of Credit
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity							$ 15,000,000
Before Amendment
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity						$ 15,000,000
After Amendment
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity						$ 35,000,000
Senior Revolving Line of Credit
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity	$ 95,000,000	$ 60,000,000
Proceeds from line of credit borrowing		18,246,000
Payments on revolving line of credit		17,657,000
Administrative and legal fees related to the issuance of line of credit		589,000
Debt issuance fees capitalized	$ 379,000	$ 591,000
Line of credit facility, expiration period		3 years
Line of credit facility expiration date	Feb. 20, 2020		Feb. 29, 2020
Amount outstanding under credit facility			$ 40,246,000
Amount available to borrow under line of credit			$ 29,505,000
Line of credit facility interest rate			4.75%
Senior Revolving Line of Credit \| Minimum
Line Of Credit Facility [Line Items]
Interest rate margin to be added on prime rate	0.75%	1.00%
Line of credit facility, unused capacity, commitment fee percentage		0.30%
Senior Revolving Line of Credit \| Maximum
Line Of Credit Facility [Line Items]
Interest rate margin to be added on prime rate	1.25%	1.50%
Line of credit facility, unused capacity, commitment fee percentage		0.375%

Commitments and Contingencies - Additional Information (Detail)			12 Months Ended
	Dec. 31, 2016 USD ($) ft² Building	Dec. 12, 2016 ft² Lease_Agreements Option $ / ft²	Dec. 31, 2016 USD ($) ft² Building	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Number of buildings leased \| Building	3		3
Lease yearly expenses			$ 4,403,000	$ 4,376,000	$ 4,099,000
Operating lease renewal option term			15 years
Percentage of present value of minimum lease payments at beginning of lease term of fair value of leased property			90.00%
Aggregate payments under lease			$ 48,600,000
Executory costs	$ 5,938,000		5,938,000
Capital lease obligation	20,720,000		20,720,000
Total payment under capital lease			10,200,000	9,884,000	$ 8,231,000
Software and maintenance
Commitments And Contingencies Disclosure [Line Items]
Financing obligation	12,932,000		12,932,000
Lease and financing arrangement
Commitments And Contingencies Disclosure [Line Items]
Financing obligation	33,665,000		33,665,000	32,089,000
Financing Obligation
Commitments And Contingencies Disclosure [Line Items]
Financing obligation	117,439,000		$ 117,439,000
Data Storage equipment
Commitments And Contingencies Disclosure [Line Items]
Capital lease agreement period			39 months
Capital lease obligation	5,080,000		$ 5,080,000
Total payment under capital lease			6,373,000
Headquarters building, build-to-suit \| Lease and financing arrangement
Commitments And Contingencies Disclosure [Line Items]
Financing obligation	31,326,000		31,326,000	$ 30,494,000
Headquarters building, build-to-suit \| Financing Obligation
Commitments And Contingencies Disclosure [Line Items]
Financing obligation	$ 114,832,000		$ 114,832,000
Minimum
Commitments And Contingencies Disclosure [Line Items]
Operating lease expiration year			2017
Minimum \| Property and Equipment
Commitments And Contingencies Disclosure [Line Items]
Capital lease agreement period			2 years
Interest rate under lease agreement			0.50%
Maximum
Commitments And Contingencies Disclosure [Line Items]
Operating lease expiration year			2031
Maximum \| Property and Equipment
Commitments And Contingencies Disclosure [Line Items]
Capital lease agreement period			5 years
Interest rate under lease agreement			13.60%
Capital Lease
Commitments And Contingencies Disclosure [Line Items]
Number of buildings leased \| Building	1		1
Build to Suit and Failed Sale Leaseback
Commitments And Contingencies Disclosure [Line Items]
Number of buildings leased \| Building	2		2
Build-to-suit Lease
Commitments And Contingencies Disclosure [Line Items]
Option to extend lease term						36 months
Build-to-suit Lease \| Maximum
Commitments And Contingencies Disclosure [Line Items]
Annual costs prior to exercise of an option to lease space in two additional adjacent buildings						$ 466,000
Termination fee if the company terminates an option to lease space in two additional adjacent buildings						$ 757,000
Non-Cancellable Leases \| Related Party Leasing Arrangements
Commitments And Contingencies Disclosure [Line Items]
Operating lease renewal option term			5 years
Number of Lease agreements \| Lease_Agreements		3
Extended leases, expiration date			Dec. 31, 2031
Area of building, lessor to build \| ft²	18,500		18,500
Waived accrued and future carrying costs and termination fees payable	$ 1,223,000		$ 1,223,000
Percentage of annual rent increase			3.00%
Reduced percentage of annual rent increase contingent upon construction of building	2.00%		2.00%
Area of building (in square foot) \| ft²	145,800		145,800
Lease first occupied date			Jan. 01, 2015
Carrying and termination fees amortization period			15 years
Lease commencement date			Jan. 01, 2015
Cancelable Lease Agreement \| Related Party Leasing Arrangements
Commitments And Contingencies Disclosure [Line Items]
Operating lease renewal option term		1 year
Percentage of annual rent increase		2.00%
Area of building (in square foot) \| ft²		145,800
Lease commencement date		Jul. 01, 2019
Lease agreement period		15 years
Notice period to renew lease		365 days
Number of options to extend operating lease \| Option		5
Annual rent per square foot \| $ / ft²		30.05
Lease term reset to original term when new building construction commence	15 years		15 years

Future Minimum Operating Lease Payments (Detail) $ in Thousands	Dec. 31, 2016 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2017	$ 1,345
2018	1,103
2019	1,117
2020	816
2021	773
Thereafter	9,131
Total minimum lease payments	$ 14,285

Financing Obligations (Detail) - Lease and financing arrangement - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Contractual Obligation [Line Items]
Financing obligations	$ 33,665	$ 32,089
Less: current portion	(757)	(1,577)
Financing obligations, net of current portion	32,908	30,512
Headquarters building, build-to-suit
Contractual Obligation [Line Items]
Financing obligations	31,326	30,494
Software and Support
Contractual Obligation [Line Items]
Financing obligations	$ 2,339	$ 1,595

Future Minimum Lease Payments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Capital Leases
2017	$ 4,935
2018	5,089
2019	4,981
2020	3,397
2021	2,941
Thereafter	34,726
Total minimum lease payments	56,069
Less: executory costs	(5,938)
Less: imputed interest	(23,258)
Less: current portion	(2,604)	$ (3,648)
Capital lease obligations, net of current portion	25,026
Financing Obligations
Executory costs	5,938
Financing Obligation
Financing Obligations
2017	7,071
2018	7,759
2019	6,859
2020	6,747
2021	6,949
Thereafter	82,054
Total minimum lease and financing obligation payments	117,439
Capital Lease Obligations
Capital Leases
Less: current portion	$ (1,847)

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares reserved for issuance under stock plans				4,243,675
Total compensation cost related to nonvested awards not yet recognized	$ 31,151
Total compensation cost related to nonvested awards not yet recognized period	2 years 5 months 16 days
Number of restricted stock units outstanding	1,467,811	1,017,450	720,370
Restricted stock units, aggregate grant date fair value	$ 33.79
Number of restricted stock units, granted	1,012,763
Number of restricted stock units expected to vest	1,282,106
Intrinsic value of restricted stock units expected to vest	$ 38,079
Aggregate fair value of restricted stock units vested	10,311	$ 6,261	$ 661
Aggregate intrinsic value of employee options exercised	$ 21,117	$ 18,873	$ 23,397
Stock-based compensation, option granted	0	0	0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock plan vesting period		4 years
Performance Based Restricted Stock Units R S Us
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting date	Dec. 31, 2017
Shares issued vesting percentage	95.00%
Number of restricted stock units outstanding	291,525
Restricted stock units, aggregate grant date fair value	$ 32.59
Number of restricted stock units, granted	26,376
Restricted stock units, aggregate grant date fair value	$ 875
Performance Based Restricted Stock Units R S Us \| Vest on December 31,2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units, granted	252,167
Restricted stock units, aggregate grant date fair value	$ 7,871
Performance Based Restricted Stock Units R S Us \| Vest on December 31,2017 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued vesting percentage	0.00%
Performance Based Restricted Stock Units R S Us \| Vest on December 31,2017 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued vesting percentage	100.00%
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share allocated to stock option plan	808,059
Stock plan vesting period	4 years
Stock plan expiration period from grant date	10 years

Number of Awards Outstanding (Detail) - shares	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options	727,559	1,684,843	2,382,881
Restricted stock units	1,467,811	1,017,450	720,370

Compensation Expense Related to Stock Options (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 18,088	$ 10,454	$ 5,588
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	2,798	1,950	986
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	3,213	2,861	1,395
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	4,532	2,399	1,376
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 7,545	$ 3,244	$ 1,831

Summary of Unvested Restricted Stock Units Activity (Detail)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Restricted stock units
Restricted stock units, beginning balance \| shares	1,017,450
Restricted stock units, granted \| shares	1,012,763
Restricted stock units, Forfeited \| shares	(266,862)
Restricted stock units, Vested \| shares	(295,540)
Restricted stock units, ending balance \| shares	1,467,811
Weighted average grant date fair value
Weighted average grant date fair value, beginning balance \| $ / shares	$ 36.90
Weighted average grant date fair value, granted \| $ / shares	33.79
Weighted average grant date fair value, Forfeited \| $ / shares	36.53
Weighted average grant date fair value, Vested \| $ / shares	36.94
Weighted average grant date fair value, ending balance \| $ / shares	$ 34.33

Summary of Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock options
Beginning Balance	1,684,843	2,382,881
Granted	0	0	0
Exercised	(944,706)
Forfeited	(12,578)
Ending Balance	727,559	1,684,843	2,382,881
Exercisable	720,053
Vested and expected to vest	727,548
Weighted Average Exercise Price
Beginning Balance	$ 7.66
Granted	0
Exercised	7.27
Forfeited	12.32
Ending Balance	8.09	$ 7.66
Exercisable	8.03
Vested and expected to vest	$ 8.09
Weighted Average Remaining Contractual Term
Outstanding	3 years 1 month 6 days
Exercisable	3 years 1 month 6 days
Vested and Expected to Vest	3 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding	$ 15,723
Exercisable	15,601
Vested and Expected to vest	$ 15,722

Stockholders' Deficit - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Feb. 24, 2015	Jun. 30, 2016	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2009
Schedule Of Stockholders Equity [Line Items]
Preferred stock, shares authorized				5,000,000	5,000,000
Common stock, authorized shares reserved for future issuance				3,734,242
Common stock, shares authorized				50,000,000	50,000,000
Maximum number of shares to be issued under warrant agreement							500,000
Warrant exercise price per share							$ 5.48
Proceeds from issuance of common stock and warrant, net of issuance costs				$ 0	$ 74,538,000	$ 0
Warrant contract term							5 years
Warrant issued, expiration term							10 years
Warrant issued, exercise period							9 years 6 months
Issuance of common stock for cashless exercise of warrant			455,521
Accretion of customer warrant						$ 744,000
Mercer LLC
Schedule Of Stockholders Equity [Line Items]
Stock issued, shares	2,817,526
Stock issued, price per share	$ 26.50
Stock issued, value	$ 74,664,000
Maximum number of shares to be issued under warrant agreement	580,813
Warrant exercise price per share	$ 26.50
Warrant term	30 months
Proceeds from issuance of common stock and warrant, net of issuance costs				$ 74,331,000
Mercer LLC \| Maximum
Schedule Of Stockholders Equity [Line Items]
Common stock ownership percentage in Mercer Health & Benefits, LLC	75.00%
Outstanding common stock ownership percentage	5.00%
Employee Stock Purchase Plan
Schedule Of Stockholders Equity [Line Items]
Common stock shares available for purchase		150,000		150,000
Percentage of common stock shares purchased on fair market value		95.00%
Maximum value of stock to be purchased per employee during the offering period		$ 12
Contributions received but not yet exercised				3,964

Common Stock for Future Issuance (Detail) - shares	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Class Of Stock [Line Items]
Restricted stock units	1,467,811		1,017,450	720,370
Outstanding stock options	727,559		1,684,843	2,382,881
Warrant to purchase common stock	580,813
Total common shares reserved for future issuance	3,734,242
Stock Award Plans
Class Of Stock [Line Items]
Common stock available for future issuance	808,059
ESPP
Class Of Stock [Line Items]
Common stock available for future issuance	150,000	150,000

Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items]
Defined benefit plan service period of employees to be eligible to participate in 401(k) plan		1 day
Eligible age of participation in 401 (k) plan		Employees are eligible to participate in the 401(k) Plan after one day of service and upon attainment of age 21
Employers matching contribution, percent		50.00%	50.00%	50.00%
Percentage of employee vesting amount on matching company contribution		20.00%	20.00%	20.00%
Employee's service requisite period for vesting matching company contribution	1 year	2 years	2 years	2 years
Employers matching contribution		$ 2,649	$ 2,570	$ 2,083
Maximum
Defined Contribution Plan Disclosure [Line Items]
Employers matching contribution percent of qualifying compensation		3.00%	3.00%	3.00%

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Income Taxes [Line Items]
Deferred tax valuation allowance	$ 103,209,000	$ 85,315,000
Increase in valuation allowance	17,894,000	26,465,000
Excess tax benefits from deductions from exercise of nonqualified stock options	21,632,000
Gross unrecognized tax benefits	437,000	437,000	$ 437,000	$ 437,000
Portion of unrecognized tax benefits for Company's effective tax rate	0	0
SOUTH CAROLINA
Schedule Of Income Taxes [Line Items]
Tax credit carryovers	10,055,000	7,598,000
Corporate Headquarters
Schedule Of Income Taxes [Line Items]
Tax credit carryovers	$ 10,055,000	7,598,000
Expiration of tax credit carryforward, beginning year	2020
Expiration of tax credit carryforward, ending year	2028
Federal
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	$ 183,528,000	123,305,000
Net operating loss carryforwards expiration, beginning year	2022
Net operating loss carryforwards expiration, ending year	2034
State and Local Jurisdiction
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	$ 176,389,000	$ 127,114,000
Unrecognized Tax Benefit
Schedule Of Income Taxes [Line Items]
Gross unrecognized tax benefits	$ 437,000
Minimum
Schedule Of Income Taxes [Line Items]
U.S. federal income tax examination year	2009
Maximum
Schedule Of Income Taxes [Line Items]
U.S. federal income tax examination year	2015

Summary of Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 0	$ 0	$ 0
State and local	17	25	25
Total current expense	17	25	25
Deferred:
Federal	0	0	0
State and local	0	0	0
Total deferred taxes	$ 0	$ 0	$ 0

Reconciliation Between Effect of Applying Federal Statutory Rate and Effective Income Tax Rate Used to Calculate Income Tax Provision (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate	34.00%	34.00%	34.00%
State income taxes, net of federal benefit	6.00%	6.00%	4.80%
Change in tax rates	2.60%	1.70%	0.40%
State tax credits	4.10%	2.50%	0.40%
Change in valuation allowance	(46.40%)	(42.90%)	(39.10%)
Uncertain tax positions	0.00%	0.00%	0.00%
Stock-based compensation	(0.10%)	0.00%	(0.40%)
Other permanent items	(0.20%)	(0.70%)	(0.10%)
Deferred true-up	0.00%	(0.60%)	0.00%
Income tax provision effective rate	0.00%	0.00%	0.00%

Components of Deferred Tax Asset and Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets relating to:
Net operating loss carryforwards	$ 65,467	$ 43,322
Deferred revenue	19,255	26,563
Commissions and incentive accrual	1,563	2,777
Deferred rent	733	962
State tax credits	6,348	4,727
Stock-based compensation	5,199	2,952
Compensation and other accruals	5,222	5,099
Total gross deferred tax assets	103,787	86,402
Deferred tax liabilities
Property and equipment and intangible assets	(578)	(1,087)
Total gross deferred tax liabilities	(578)	(1,087)
Deferred tax assets less liabilities	103,209	85,315
Less: valuation allowance	(103,209)	(85,315)
Net deferred tax asset (liability)	$ 0	$ 0

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Beginning balance	$ 437	$ 437	$ 437
Additions based on tax positions related to the current year	0	0	0
Additions for tax positions in prior years	0	0	0
Reductions for tax positions of prior years	0	0	0
Reductions for tax positions due to lapse of statute	0	0	0
Settlements	0	0	0
Ending balance	$ 437	$ 437	$ 437

Segments and Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net revenue from external customers	$ 62,647	$ 58,022	$ 57,874	$ 54,792	$ 54,340	$ 45,426	$ 42,708	$ 42,669	$ 233,335	$ 185,143	$ 137,420
Depreciation and amortization									13,073	11,664	9,493
Gross profit	$ 30,125	$ 28,910	$ 28,124	$ 25,495	$ 23,857	$ 19,161	$ 19,068	$ 20,206	112,654	82,292	49,950
Employer
Segment Reporting Information [Line Items]
Net revenue from external customers									140,522	94,842	62,016
Depreciation and amortization									7,950	6,024	4,392
Gross profit									53,031	33,655	16,186
Carrier
Segment Reporting Information [Line Items]
Net revenue from external customers									92,813	90,301	75,404
Depreciation and amortization									5,123	5,640	5,101
Gross profit									$ 59,623	$ 48,637	$ 33,764

Related Parties - Additional Information (Detail)			12 Months Ended
Related Parties - Additional Information (Detail)	Dec. 31, 2016 USD ($) ft²	Dec. 12, 2016 ft² Lease_Agreements Option Person $ / ft²	Dec. 31, 2016 USD ($) ft² Person	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Aug. 27, 2013 USD ($)
Related Party Transaction [Line Items]
Operating lease renewal option term			15 years
Lease operating expenses			$ 10,417,000	$ 11,940,000	$ 5,634,000
Due to related party, current	$ 854,000		854,000	1,116,000
Accounts receivable, related party, net	4,626,000		4,626,000	2,082,000
Revolving Line of Credit
Related Party Transaction [Line Items]
Revolving commitment amount from related party						$ 15,000,000
Stockholders and Executives
Related Party Transaction [Line Items]
Due to related party, current	0		0	0
Transportation service from related party			80,000	127,000	$ 438,000
Mercer LLC
Related Party Transaction [Line Items]
Revenue from related parties			26,720,000	13,552,000
Accounts receivable, related party, net	4,626,000		4,626,000	2,082,000
Deferred revenue	7,683,000		$ 7,683,000	9,128,000
Mercer LLC \| Minimum
Related Party Transaction [Line Items]
Percentage of ownership interest sold by parent			10.00%
Goldman Sachs Group, Inc.
Related Party Transaction [Line Items]
Outstanding common stock ownership percentage			20.50%
Goldman Sachs Group, Inc. \| Revolving Line of Credit
Related Party Transaction [Line Items]
Revolving commitment amount from related party	10,000,000		$ 10,000,000
Line of credit facility interest rate			10.50%
Amount outstanding under credit facility	40,246,000		$ 40,246,000
Due to related party	4,226,000		4,226,000
Accounts Payable
Related Party Transaction [Line Items]
Due to related party, current				628,000
Accrued Expenses
Related Party Transaction [Line Items]
Due to related party, current	$ 854,000		$ 854,000	$ 488,000
Related Party Leasing Arrangements \| Non-Cancellable Leases
Related Party Transaction [Line Items]
Number of stockholders and executives affiliated to leasing entity \| Person			2
Number of Lease agreements \| Lease_Agreements		3
Operating lease renewal option term			5 years
Percentage of annual rent increase			3.00%
Area of building (in square foot) \| ft²	145,800		145,800
Lease commencement date			Jan. 01, 2015
Extended leases, expiration date			Dec. 31, 2031
Area of building, lessor to build \| ft²	18,500		18,500
Waived accrued and future carrying costs and termination fees payable	$ 1,223,000		$ 1,223,000
Reduced percentage of annual rent increase contingent upon construction of building	2.00%		2.00%
Related Party Leasing Arrangements \| Cancelable Lease Agreement
Related Party Transaction [Line Items]
Number of stockholders and executives affiliated to leasing entity \| Person		2
Operating lease renewal option term		1 year
Percentage of annual rent increase		2.00%
Area of building (in square foot) \| ft²		145,800
Lease commencement date		Jul. 01, 2019
Lease agreement period		15 years
Notice period to renew lease		365 days
Number of options to extend operating lease \| Option		5
Annual rent per square foot \| $ / ft²		30.05
Lease term reset to original term when new building construction commence	15 years		15 years

Unaudited Quarterly Statements of Operations Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Revenue

$ 62,647

$ 58,022

$ 57,874

$ 54,792

$ 54,340

$ 45,426

$ 42,708

$ 42,669

$ 233,335

$ 185,143

$ 137,420

Gross profit

30,125

28,910

28,124

25,495

23,857

19,161

19,068

20,206

112,654

82,292

49,950

Total operating expenses

35,189

35,434

37,215

36,984

34,482

33,953

35,468

32,663

144,822

136,566

108,853

Operating loss

(5,064)

(6,524)

(9,091)

(11,489)

(10,625)

(14,792)

(16,400)

(12,457)

(32,168)

(54,274)

(58,903)

Net loss

$ (7,099)

$ (8,603)

$ (11,004)

$ (13,352)

$ (12,487)

$ (16,664)

$ (18,284)

$ (14,649)

$ (40,058)

$ (62,084)

$ (63,179)

Basic and diluted

$ (0.24)

^[1]

$ (0.29)

^[1]

$ (0.37)

^[1]

$ (0.46)

^[1]

$ (0.43)

^[1]

$ (0.58)

^[1]

$ (0.64)

^[1]

$ (0.55)

^[1]

$ (1.35)

$ (2.19)

$ (2.51)

Weighted-average common shares outstanding, basic and diluted

30,030,164

29,651,230

29,459,341

29,213,198

29,120,171

28,847,493

28,633,992

26,745,444

29,589,857

28,344,680

25,207,099

[1]	Quarterly and year-to-date computations of per share amounts are made independently. Therefore, the sum of the per-share amounts for the quarters may not agree with per share amounts for the year.

Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2017	Feb. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Number of restricted stock units, granted			1,012,763
Common stock, shares issued			30,429,014	29,194,332
Payments on revolving line of credit			$ 74,000	$ 44,903	$ 2,100
Senior Revolving Line of Credit
Subsequent Event [Line Items]
Payments on revolving line of credit		$ 17,657
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Vesting period of restricted stock awards				4 years
Subsequent Event \| Senior Revolving Line of Credit
Subsequent Event [Line Items]
Payments on revolving line of credit	$ 20,000
Subsequent Event \| Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Number of restricted stock units, granted	22,278
Restricted stock units, aggregate grant date fair value	$ 668
Vesting period of restricted stock awards	4 years
Common stock, shares issued	267,885

Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Allowance for doubtful accounts and returns

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at Beginning of Period

$ 2,585

$ 1,663

$ 810

Additions Charged To Expense

667

Additions Charged Against Revenue

5,004

7,646

4,585

Deductions

(3,661)

(6,746)

(3,826)

Balance at End of Period

4,595

2,585

1,663

Deferred tax asset valuation allowance

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at Beginning of Period

85,315

58,850

34,425

Additions Charged To Costs and Expenses

^[1]

17,894

26,465

24,425

Deductions

Balance at End of Period

$ 103,209

$ 85,315

$ 58,850

[1]	Increase in valuation allowance is related to the generation of net operating losses and other deferred tax assets.

Marketable Securities - Additional Information (Detail)	12 Months Ended
Marketable Securities - Additional Information (Detail)	Dec. 31, 2016
Maximum
Gain (Loss) on Investments [Line Items]
Held-to-maturity securities, contractual maturity period	1 month