Benefitfocus (BNFT) 10-K 26 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	BNFT
Entity Registrant Name	Benefitfocus,Inc.
Entity Central Index Key	1,576,169
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		32,040,894
Entity Public Float			$ 547,962,879

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 190,928	$ 55,335
Accounts receivable, net	21,077	30,091
Contract, prepaid and other current assets	16,667	15,859
Total current assets	228,672	101,285
Property and equipment, net	69,965	72,681
Intangible assets, net	0	150
Goodwill	1,634	1,634
Deferred contract costs and other non-current assets	13,668	16,253
Total assets	313,939	192,003
Current liabilities:
Accounts payable	8,687	4,260
Accrued expenses	11,461	9,110
Accrued compensation and benefits	17,269	14,250
Deferred revenue, current portion	36,540	43,804
Revolving line of credit, current portion	0	24,000
Financing and capital lease obligations, current portion	4,486	3,423
Total current liabilities	78,443	98,847
Deferred revenue, net of current portion	9,323	11,223
Convertible senior notes	176,692	0
Revolving line of credit, net of current portion	0	32,246
Financing and capital lease obligations, net of current portion	57,116	55,597
Other non-current liabilities	2,575	2,809
Total liabilities	324,149	200,722
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, 2018 and December 31, 2017	0	0
Common stock, par value $0.001, 50,000,000 shares authorized, 32,017,773 and 31,307,989 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	32	31
Additional paid-in capital	403,631	352,496
Accumulated deficit	(413,873)	(361,246)
Total stockholders' deficit	(10,210)	(8,719)
Total liabilities and stockholders' deficit	$ 313,939	$ 192,003

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
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	32,017,773	31,307,989
Common stock, shares outstanding	32,017,773	31,307,989

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenue	$ 258,721	$ 236,842	$ 236,523
Cost of revenue	129,277	127,382	123,308
Gross profit	129,444	109,460	113,215
Operating expenses:
Sales and marketing	78,179	70,583	56,311
Research and development	47,902	49,549	56,610
General and administrative	43,062	27,268	32,750
Total operating expenses	169,143	147,400	145,671
Loss from operations	(39,699)	(37,940)	(32,456)
Other income (expense):
Interest income	250	182	138
Interest expense on building lease financing obligations	(7,471)	(7,450)	(6,826)
Interest expense on other borrowings	(5,685)	(4,931)	(1,095)
Other income (expense)	6	(140)	(90)
Total other expense, net	(12,900)	(12,339)	(7,873)
Loss before income taxes	(52,599)	(50,279)	(40,329)
Income tax expense	28	15	17
Net loss	(52,627)	(50,294)	(40,346)
Comprehensive loss	$ (52,627)	$ (50,294)	$ (40,346)
Net loss per common share:
Basic and diluted	$ (1.66)	$ (1.62)	$ (1.36)
Weighted-average common shares outstanding:
Basic and diluted	31,756,415	31,052,378	29,589,857

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Previously Reported	Common Stock, $0.001 Par Value	Common Stock, $0.001 Par ValuePreviously Reported	Additional Paid-in Capital	Additional Paid-in CapitalPreviously Reported	Accumulated Deficit	Accumulated DeficitPreviously Reported
Cumulative effect adjustment from adoption of accounting standard | Accounting Standards Update ("ASU") 2014-09	$ 55,322		$ 0		$ (2,805)		$ 58,127
Balance at Dec. 31, 2015	37,313	$ (18,009)	$ 29	$ 29	307,499	$ 310,304	(270,215)	$ (328,342)
Balance (in shares) at Dec. 31, 2015			29,194,332	29,194,332
Exercise of stock options	6,870		$ 1		6,869		0
Exercise of stock options (in shares)			944,706
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes	(202)		$ 0		(202)		0
Issuance of common stock upon vesting of restricted stock units, net of shares surrendered for taxes (in shares)			289,976
Stock-based compensation expense	18,088		$ 0		18,088		0
Net loss	(40,346)		0		0		(40,346)
Balance at Dec. 31, 2016	21,723		$ 30		332,254		(310,561)
Balance (in shares) at Dec. 31, 2016			30,429,014
Exercise of stock options	3,458		$ 1		3,457		0
Exercise of stock options (in shares)			463,870
Issuance of common stock upon vesting of restricted stock units	0		$ 0		0		0
Issuance of common stock upon vesting of restricted stock units (in shares)			406,936
Issuance of common stock under Employee Stock Purchase Plan, or ESPP	257		$ 0		257		0
Issuance of common stock under Employee Stock Purchase Plan, or ESPP (in shares)			8,169
Stock-based compensation expense	16,137		$ 0		16,137		0
Net loss	(50,294)		0		0		(50,294)
Balance at Dec. 31, 2017	$ (8,719)		$ 31		352,496		(361,246)
Balance (in shares) at Dec. 31, 2017	31,307,989		31,307,989
Cumulative effect adjustment from adoption of accounting standard | Accounting Standards Update 2016-09	$ 0		$ 0		391		(391)
Exercise of stock options	$ 186		$ 0		186		0
Exercise of stock options (in shares)	29,908		29,908
Issuance of common stock upon vesting of restricted stock units	$ 0		$ 1		(1)		0
Issuance of common stock upon vesting of restricted stock units (in shares)			663,419
Issuance of common stock under Employee Stock Purchase Plan, or ESPP	526		$ 0		526		0
Issuance of common stock under Employee Stock Purchase Plan, or ESPP (in shares)			16,457
Purchase of convertible note capped call hedge	(33,024)		$ 0		(33,024)		0
Equity component of convertible notes	56,950		0		56,950		0
Stock-based compensation expense	26,498		0		26,498		0
Net loss	(52,627)		0		0		(52,627)
Balance at Dec. 31, 2018	$ (10,210)		$ 32		$ 403,631		$ (413,873)
Balance (in shares) at Dec. 31, 2018	32,017,773		32,017,773

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net loss	$ (52,627)	$ (50,294)	$ (40,346)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation and amortization	15,815	15,906	13,073
Stock-based compensation expense	28,868	16,137	18,088
Interest accrual on financing obligations	7,521	7,500	6,827
Loss on disposal or impairment of property and equipment	7	157	141
Provision for doubtful accounts	364	75	667
Changes in operating assets and liabilities:
Accounts receivable, net	8,650	2,800	(3,936)
Accrued interest on short-term investments	0	7	220
Contract, prepaid and other current assets	(570)	4,519	(6,716)
Deferred costs and other non-current assets	3,137	5,538	3,816
Accounts payable and accrued expenses	6,566	(3,015)	(859)
Accrued compensation and benefits	649	(3,097)	(3,337)
Deferred revenue	(9,165)	(1,922)	(12,537)
Other non-current liabilities	(234)	(248)	2,073
Net cash and cash equivalents provided by (used in) operating activities	8,981	(5,937)	(22,826)
Cash flows from investing activities
Purchases of short-term investments held to maturity	0	0	(2,004)
Proceeds from short-term investments held to maturity	0	2,000	40,225
Purchases of property and equipment	(8,290)	(8,279)	(12,705)
Net cash and cash equivalents (used in) provided by investing activities	(8,290)	(6,279)	25,516
Cash flows from financing activities
Draws on revolving line of credit	115,000	105,000	84,000
Payments on revolving line of credit	(171,246)	(89,000)	(74,000)
Proceeds from issuance of convertible notes	240,000	0	0
Payments of debt issuance costs and deferred financing costs	(6,000)	0	(379)
Purchase of convertible note capped call hedge	(33,024)	0	0
Proceeds from exercises of stock options and ESPP	712	3,715	6,870
Remittance of taxes upon vesting of restricted stock units	0	0	(202)
Payments on financing and capital lease obligations	(10,540)	(9,017)	(10,200)
Net cash and cash equivalents provided by financing activities	134,902	10,698	6,089
Net increase (decrease) in cash and cash equivalents	135,593	(1,518)	8,779
Cash and cash equivalents, beginning of year	55,335	56,853	48,074
Cash and cash equivalents, end of year	190,928	55,335	56,853
Supplemental disclosure of non-cash investing and financing activities
Property and equipment purchases in accounts payable and accrued expenses	244	389	699
Property and equipment purchased with financing and capital lease obligations	4,810	0	28,032
Post contract support purchased with financing obligations	790	0	1,048
Debt issuance costs included in accounts payable and accrued expenses	358	0	0
Supplemental disclosure of cash flow information
Income taxes paid	28	14	7
Interest paid	$ 11,884	$ 10,911	$ 6,655

Organization and Description of

Organization and Description of Business	12 Months Ended
	Dec. 31, 2018
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, suppliers and brokers that is designed to simplify how organizations and individuals transact benefits. The financial statements of the Company include the financial position and operations of its wholly owned subsidiaries, Benefitfocus.com, Inc. and BenefitStore, Inc.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
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 related reserves, 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 its revenues primarily from fees for software services and professional services sold to employers and insurance carriers. Revenues are recognized when control of these services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. Taxes collected from customers relating to services and remitted to governmental authorities are excluded from revenues. The Company determines revenue recognition through the following steps: • Identification of each contract with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, performance obligations are satisfied. Software Services Revenues Software services revenues primarily consist of monthly subscription fees paid to the Company by its employer and insurance carrier customers for access to, and usage of, cloud-based benefits software solutions for a specified contract term. Fees are generally charged based on the number of employees or subscribers with access to the solution. Software services revenue also includes certain other revenue which is generated from the value of policies or products enrolled in through the Company’s marketplace. Software services revenues are generally recognized on a ratable basis over the contract term beginning on the date the software services are made available to the customer. The Company’s software service contracts are generally three years for both carrier and employer customers. Revenue from insurance broker commissions and supplier transactions is recognized at a point in time when the orders for the policies are received and transferred to the insurance carrier or supplier, and is reduced by estimates for risks from collectability, policy cancellation and termination. Professional Services Revenues Professional services revenues primarily consist of fees related to the implementation of software products purchased by customers. Professional services typically include discovery, configuration and deployment, integration, testing, and training. Fees from consulting services, support services and training are also included in professional services revenue. Revenue from implementation services with customers in the Carrier segment are generally recognized over the contract term of the associated software services contract, including any extension periods representing a material right. In certain arrangements, the Company utilizes estimates of hours as a measure of progress to determine revenue. Revenues from implementation services with customers in the Employer segment are generally recognized as those services are performed. Revenues from support and training fees are recognized over the service period. Contracts with Multiple Performance Obligations Certain of the Company’s contracts with customers contain multiple performance obligations. For these contracts, the individual performance obligations are accounted for separately if they are distinct. The Company allocates the transaction price to the separate performance obligations based on their relative standalone selling prices. The Company determines the standalone selling prices based on its overall pricing objectives, taking into consideration market conditions and other factors, including the value of its contracts, the software services sold, customer size and complexity, and the number and types of users under the contracts. Practical Expedients Elected In addition to practical expedients disclosed elsewhere in the notes to consolidated financial statements, the Company has elected to use the practical expedient not to adjust the promised amount of consideration for the effects of a significant financing component for contracts in which the period between transferring a service to a customer and when the customer pays for that service is one year or less. Contract Costs The Company capitalizes costs to obtain contracts that are considered incremental and recoverable, such as sales commissions. Payments of sales commissions generally include multiple payments. The Company capitalizes only those payments made within an insignificant time from the contract inception, typically three months or less. Subsequent payments are expensed as incurred. The capitalized costs are amortized to sales and marketing expense over the estimated period of benefit of the asset, which is generally four to five years. The Company has elected to use the practical expedient to expense the costs to obtain a contract when the amortization period is less than one year. The balance of deferred costs related to obtaining contracts included in deferred contract costs and other non-current assets was $7,506 and $7,376 as of December 31, 2018 and 2017, respectively. Sales and marketing expense includes $4,217, $4,488 and $4,348 of amortization for the years ended December 31, 2018, 2017 and 2016, respectively. The Company capitalizes contract fulfillment costs directly associated with customer contracts that are not related to satisfying performance obligations. The costs are amortized to cost of revenue expense over the estimated period of benefit, which is generally five years. The balance of deferred fulfillment costs included in deferred contract costs and other non-current assets was $5,235 and $8,060 as of December 31, 2018 and 2017, respectively. Cost of revenue expense includes $3,480, $3,525 and $3,187 of amortization for the years ended December 31, 2018, 2017 and 2016, respectively. 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 facilities and security costs, 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 12% of the total accounts receivable at December 31, 2017, and approximately 13%, 11% and 12% of total revenue for the year ended December 31, 2018, 2017 and 2016, respectively. The revenue is attributable to the Company’s Employer segment. 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 $392 and $654 as of December 31, 2018 and 2017, 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 $3,191 and $2,877 as of December 31, 2018 and 2017, 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 are 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. 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. 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 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 Company compares the fair value of a reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of our reporting unit, an impairment loss is recorded equal to the difference. The Company has identified two reporting units, 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. Debt Issuance Costs Debt issuance costs related to the convertible senior note financing have been recorded as a reduction of the carrying amount of the debt and are amortized to interest expense using the effective interest method. Debt issuance costs related to the revolving line of credit have been recorded in other non-current assets and are amortized to interest expense over the remaining life of the agreement. 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 software licenses. Advertising The Company expenses advertising costs as they are incurred. Direct advertising costs for the years ended December 31, 2018, 2017 and 2016 were $391, $168 and $635, 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 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, prior to January 1, 2017, the recognition of stock-based compensation expense required 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. Starting January 1, 2017, the Company recognizes the effect of forfeitures as they occur. The recognition of stock-based compensation expense associated with performance-based restricted stock units requires the estimation of the probability of achieving performance measures. The Company adopted the guidance in Accounting Standards Update ("ASU") 2016-09, “Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting,” on January 1, 2017. Under this ASU, entities are permitted to make an accounting policy election to either estimate forfeitures on share-based payment awards, as previously required, or to recognize forfeitures as they occur. The Company has elected to recognize forfeitures as they occur and the impact of that change in accounting policy has been recorded as a $391 cumulative effect adjustment to its accumulated deficit as of January 1, 2017. 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. Income tax effects related to settlements of share-based payment awards are reported in earnings as an increase or decrease to income tax expense (benefit), net. Additionally, income tax-related cash flows resulting from share-based payments are reported as operating activities in the statement of cash flows. Basic and Diluted Net Loss per Common Share Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including outstanding stock options, outstanding warrants, common stock related to unvested restricted stock units and convertible senior notes to the extent dilutive, and common stock issuable pursuant to the ESPP. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-dilutive. Recent Accounting Pronouncements Recently Adopted Accounting Standards Goodwill Impairment In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-04, "Simplifying the Test for Goodwill Impairment." The ASU 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. The Company adopted this guidance for its goodwill impairment test performed as of October 31, 2018. Adoption did not have any impact on the Company’s consolidated financial statements. Cloud Computing Arrangements In August 2018, the FASB issued Accounting Standards Update (“ASU”) 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract.” The ASU allows companies to capitalize implementation costs incurred in a hosting arrangement that is a service contract over the term of the arrangement, including periods covered by renewal options that are reasonably certain to be exercised. The Company early adopted this standard on a prospective basis in the quarter ended September 30, 2018. There was no impact on the Company’s consolidated financial statements upon adoption. Revenue from Contracts with Customers On January 1, 2018, the Company adopted ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” applying the full retrospective transition method to all contracts that were not completed as of January 1, 2016, the initial date of application. The adoption of Topic 606 significantly affected the accounting for revenue from certain professional services in the Carrier segment and insurance broker commission revenue included in software services revenue in the Employer segment. Prior to the adoption of Topic 606, the Company recognized revenue from certain professional services in the Carrier segment over the customer relationship period. Under Topic 606, revenue from certain of these services are recognized over the contract term of the associated software services contract, including any extension periods representing a material right, which can be shorter than the customer relationship period. The financial statement impact of this change is a reduction to the deferred revenue balance as of the date of adoption. Also prior to the adoption of Topic 606, the Company recognized insurance broker commission revenue over the policy period. Under Topic 606, the revenue related to broker commissions is recognized when the performance obligation has been satisfied, which is when the orders for the policies are received and transferred to the insurance carrier. As a result, software services revenue from these arrangements in the Employer segment is recognized in the aggregate and earlier under Topic 606 in comparison to the previous treatment. The financial statement impact of this change is reductions to balances of deferred revenue and increases in contract asset balances reported in other non-current assets. Additionally, prior to the adoption of Topic 606, the Company recognized revenue from implementation services fees that are paid in advance in the Employer segment either when the associated software services are made available to the customer or over the customer relationship period. Under the new standard, revenue from these fees are recognized as the services are provided on a percentage of completion basis. The financial statement impact of this change is revenue from these fees being recognized sooner under the new standard. In connection with the adoption of Topic 606, the Company is required to capitalize costs associated with obtaining and fulfilling a contract. Contract assets recognized for costs to obtain a contract consist primarily of sales commissions associated with obtaining contracts in the Carrier segment. These assets are amortized to sales and marketing expense over the estimated period of benefit of the asset, which is generally four to five years. Contract assets recognized for costs to fulfill a contract consist primarily of internal costs related to implementing products in the Carrier segment. These assets are amortized to cost of revenue expense over the estimated period of benefit, which is generally five years. The Company used the practical expedient for contracts that were completed by January 1, 2016, the initial date of application of Topic 606, that allows for the use of the transaction price at the date the contract was completed for contracts restated in comparative reporting periods, rather than estimating the variable consideration amount in each comparative reporting period. The following tables show the amounts by which financial statement lines were affected by the adoption of Topic 606. As of December 31, 2017 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Balance Sheet: Accounts receivable, net $ 30,156 $ (65 ) $ 30,091 Contract, prepaid and other current assets 4,337 11,522 15,859 Deferred contract costs and other non-current assets 816 15,437 16,253 Accrued expenses 9,136 (26 ) 9,110 Deferred revenue, current portion 38,821 4,983 43,804 Deferred revenue, net of current portion 19,898 (8,675 ) 11,223 Additional paid-in capital 355,301 (2,805 ) 352,496 Accumulated deficit (394,663 ) 33,417 (361,246 ) Year Ended December 31, 2017 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Statement of Operations and Comprehensive Loss: Revenue $ 256,735 $ (19,893 ) $ 236,842 Cost of revenue 124,156 3,226 127,382 Sales and marketing 69,280 1,303 70,583 Loss from operations (13,518 ) (24,422 ) (37,940 ) Net loss and comprehensive loss (25,872 ) (24,422 ) (50,294 ) Net loss per common share: Basic and diluted $ (0.83 ) $ (0.79 ) $ (1.62 ) Year Ended December 31, 2016 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Statement of Operations and Comprehensive Loss: Revenue $ 233,335 $ 3,188 $ 236,523 Cost of revenue 120,681 2,627 123,308 Sales and marketing 55,488 823 56,311 Research and development 56,584 26 56,610 Loss from operations (32,168 ) (288 ) (32,456 ) Net loss and comprehensive loss (40,058 ) (288 ) (40,346 ) Net loss per common share: Basic and diluted $ (1.35 ) $ (0.01 ) $ (1.36 ) Cash provided by, or used in, operating, investing and financing activities were not affected by the adoption of Topic 606. Accounting Standards Not Yet Adopted In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” The ASU modifies the disclosure requirements required for fair value measurements. This ASU is effective for the Company for the interim and annual reporting periods starting January 1, 2020. Early adoption is permitted. The Company does not expect this guidance to have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): 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 starting January 1, 2020. The Company is currently evaluating the impact of this guidance 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. Topic 842 introduces new disclosure requirements for leasing arrangements and is effective for the Company beginning January 1, 2019. The Company will apply Topic 842 without presenting comparative period financial statements, thus will recognize a cumulative-effect adjustment to the opening balance of retained earnings as of January 1, 2019. The Company plans to utilize the following additional significant transition elections: • Elect the package of three practical expedients to not reassess: o whether any expired or existing contracts are or contain a lease; o the classification of any expired or existing leases; and o the treatment of initial direct costs. • Adopt a policy to not separate lease and associated nonlease components for all classes of assets. The Company will apply this policy to all existing leases on transition as well as new leases going forward. The Company is continuing to evaluate the effect of adoption of this standard on its consolidated financial statements. The Company expects its consolidated financial statements to be significantly affected by the following: • Assets and related financing obligations for the Company’s existing build-to-suit lease arrangements will be derecognized with a cumulative adjustment to retained earnings. These leases will be transitioned to the new standard based on a proforma analysis of the lease balances as of the transition date as if they had been a lease under ASC 840. Based on this analysis, the land component of these leases will be combined with the remainder of the lease obligation. Currently, this obligation is accounted for separately and recognized as part of facility expense. The following impacts are expected on the Company’s consolidated financial statements: o Operating expenses will increase as depreciation expense related to the buildings will increase as function of shorteni

Net Loss Per Common Share

Net Loss Per Common Share	12 Months Ended
	Dec. 31, 2018
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 2018 2017 2016 Restricted stock units 2,174,250 1,937,014 1,467,811 Stock options 233,247 263,155 727,559 Convertible senior notes 4,513,824 - - Warrant to purchase common stock - - 580,813 Employee Stock Purchase Plan - 7,039 3,964 Total anti-dilutive common share equivalents 6,921,321 2,207,208 2,780,147 In connection with its issuance of the convertible senior notes in December 2018, the Company paid $33,024 to enter into capped call option agreements to reduce the potential dilution to holders of the Company’s common stock upon conversion of the convertible senior notes. The capped call option agreements are excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is antidilutive. Basic and diluted net loss per common share is calculated as follows: Year Ended December 31, 2018 2017 2016 Numerator: Net loss $ (52,627 ) $ (50,294 ) $ (40,346 ) Net loss attributable to common stockholders $ (52,627 ) $ (50,294 ) $ (40,346 ) Denominator: Weighted-average common shares outstanding, basic and diluted 31,756,415 31,052,378 29,589,857 Net loss per common share, basic and diluted $ (1.66 ) $ (1.62 ) $ (1.36 )

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement	4. 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, 2018 and 2017. December 31, 2018 Description Level 1 Level 2 Level 3 Total Cash Equivalents: Money market mutual funds (1) $ 182,748 $ - $ - $ 182,748 Total assets $ 182,748 $ - $ - $ 182,748 December 31, 2017 Description Level 1 Level 2 Level 3 Total Cash Equivalents: Money market mutual funds (1) $ 46,730 $ - $ - $ 46,730 Total assets $ 46,730 $ - $ - $ 46,730 (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.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Property and Equipment	5. Property and Equipment Property and equipment consists of the following as of December 31: 2018 2017 Buildings, leased $ 48,558 $ 48,558 Computers and related equipment 38,183 35,728 Purchased software and licenses 30,702 27,317 Developed software 36,713 30,624 Furniture and fixtures 6,773 6,669 Leasehold improvements 4,633 4,289 Other equipment 2,313 2,260 Vehicles 146 146 Total property and equipment, at cost 168,021 155,591 Accumulated depreciation and amortization (98,056 ) (82,910 ) Property and equipment, net $ 69,965 $ 72,681 Depreciation and amortization expense on property and equipment was $15,665, $15,648 and $12,816, for the years ended December 31, 2018, 2017 and 2016, respectively. Property and equipment includes fixed assets acquired under capital lease agreements of $31,148 and $35,761 for the years ended December 31, 2018 and 2017. Accumulated depreciation of assets under capital leases totaled $6,216 and $9,633 as of December 31, 2018 and 2017, respectively. Amortization of assets under capital leases is included in depreciation expense. The Company capitalized software development costs of $6,090 and $4,482 for the years ended December 31, 2018 and 2017, respectively. Amortization of capitalized software development costs totaled $3,944, $3,257 and $2,857 during the years ended December 31, 2018, 2017 and 2016, respectively. The net book value of capitalized software development costs was $9,806 and $7,660 at December 31, 2018, and 2017, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	6. 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, 2018 and 2017. Information regarding the Company’s acquisition-related intangible assets is as follows: As of December 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Remaining Useful Life (in years) Trademarks $ 240 $ (240 ) $ - - Customer agreements 2,060 (2,060 ) - - Non-compete agreements 126 (126 ) - - Total $ 2,426 $ (2,426 ) $ - - As of December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Remaining Useful Life (in years) Trademarks $ 240 $ (240 ) $ - - Customer agreements 2,060 (1,910 ) 150 0.6 Non-compete agreements 126 (126 ) - - Total $ 2,426 $ (2,276 ) $ 150 0.6 Amortization expense of acquisition-related intangible assets for the years ended December 31, 2018, 2017 and 2016 was $150, $258 and $257, respectively. As of December 31, 2018, the acquisition-related intangible assets were fully amortized. There were no impairments of intangible assets during the years ended December 31, 2018, 2017 and 2016.

Convertible Senior Notes

Convertible Senior Notes	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Convertible Senior Notes	7. Convertible Senior Notes In December 2018, the Company issued $240,000 aggregate principal amount of 1.25% convertible senior notes (“Notes”) due December 15, 2023, unless earlier repurchased by the Company or converted by the holder pursuant to their terms. Interest is payable semiannually in arrears on June 15 and December 15 of each year, commencing on June 15, 2019. The Notes are governed by an Indenture between the Company, as issuer, and U.S. Bank, National Association, as trustee. The Notes are unsecured and rank: senior in right of payment to the Company’s future indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment to the Company’s unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of the Company’s senior, secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities incurred by the Company’s subsidiaries. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of the Company’s common stock or a combination of cash and shares of common stock, at the Company’s election. The Notes have an initial conversion rate of 18.8076 shares of common stock per $1 principal amount of Notes. This represents an initial effective conversion price of approximately $53.17 per share of common stock and 4,513,824 shares issuable upon conversion. Throughout the term of the Notes, the conversion rate may be adjusted upon the occurrence of certain events. Holders of the Notes will not receive any cash payment representing accrued and unpaid interest, if any, upon conversion of a Note, except in limited circumstances. Accrued but unpaid interest will be deemed to be paid by cash, shares of the Company’s common stock or a combination of cash and shares of the Company’s common stock paid or delivered, as the case may be, to the holder upon conversion of Notes. Prior to the close of business on September 14, 2023, the Notes will be convertible at the option of holders during certain periods, only upon satisfaction of certain conditions set forth below. On or after September 15, 2023, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes at the conversion price at any time regardless of whether the conditions set forth below have been met. Holders may convert all or a portion of their Notes prior to the close of business on September 14, 2023, in multiples of $1 principal amount, only under the following circumstances: • during any calendar quarter commencing after the calendar quarter ending on March 31, 2019 (and only during such calendar quarter), if the last reported sales price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period, or the Notes measurement period, in which the “trading price” (as defined in the Indenture) per $1 principal amount of notes for each trading day of the Notes measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; • if the Company calls any or all of the Notes for redemption, at any time prior to the close of business on September 14, 2023; or • upon the occurrence of specified corporate events. As of December 31, 2018, the Notes are not yet convertible. Based on market data available for publicly traded, senior, unsecured corporate bonds issued by companies in the same industry and with similar maturity, the Company estimated the implied market interest rate of its Notes to be approximately 7.30%, assuming no conversion option. Assumptions used in the estimate represent what market participants would use in pricing the liability component of the Notes, including market interest rates, credit standing, and yield curves, all of which are defined as Level 2 observable inputs. The estimated implied interest rate was applied to the Notes, which resulted in a fair value of the liability component of $181,500 upon issuance, calculated as the present value of future contractual payments based on the $240,000 aggregate principal amount. The excess of the principal amount of the liability component over its carrying amount, or the debt discount, is amortized to interest expense over the term of the Notes. The $58,500 difference between the In accounting for the transaction costs related to the issuance of the Notes, the Company allocated the total amount incurred to the liability and equity components in proportion to the allocation of proceeds. Transaction costs attributable to the liability component, totaling $4,808, are being amortized to expense over the term of the Notes, and transaction costs attributable to the equity component, totaling $1,550, and were included with the equity component in shareholders’ equity. The Notes consist of the following as of December 31: 2018 2017 Liability Component: Principal $ 240,000 $ - Less: debt discount, net of amortization (63,308 ) - Net carrying amount $ 176,692 $ - Equity component (a) 56,950 - (a) Recorded in the consolidated balance sheet within additional paid-in capital, net of $1,550 transaction costs in equity. The following table sets forth total interest expense recognized related to the Notes: Year Ended December 31, 2018 2017 1.25% coupon $ 42 $ - Amortization of debt discount and transaction costs - - $ 42 $ - As of December 31, 2018, the fair value of the Notes, which was determined based on inputs that are observable in the market or that could be derived from, or corroborated with, observable market data, quoted price of the Notes in an over-the-counter market (Level 2), and carrying value of debt instruments (carrying value excludes the equity component of the Company’s convertible notes classified in equity) were as follows: December 31, 2018 December 31, 2017 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 254,400 $ 176,692 $ - $ - In connection with the issuance of the Notes, the Company entered into capped call transactions with certain counterparties affiliated with the initial purchasers and others. The capped call transactions are expected to reduce potential dilution of earnings per share upon conversion of the Notes. Under the capped call transactions, the Company purchased capped call options that in the aggregate relate to the total number of shares of the Company’s common stock underlying the Notes, with an initial strike price of approximately $53.17 per share, which corresponds to the initial conversion price of the Notes and is subject to anti-dilution adjustments substantially similar to those applicable to the conversion rate of the Notes, and have a cap price of approximately $89.98. The cost of the purchased capped calls of $33,024 was recorded to stockholders’ deficit and will not be re-measured. Based on the closing price of our common stock of $45.72 on December 31, 2018, the if-converted value of the Notes was less than their respective principal amounts.

Revolving Line of Credit

Revolving Line of Credit	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Revolving Line of Credit	8. Revolving Line of Credit In February 2015, the Company executed a loan and security agreement with a syndicate of lenders led by Silicon Valley Bank for a senior revolving credit agreement (“Senior Revolver”) to replace its then current revolving line of credit. 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 2016, the Company amended its Senior Revolver agreement. The amendments, among other things, increased the borrowing capacity to $95,000, extended the termination date of the facility to February 20, 2020, added Goldman Sachs Lending Partners LLC to the lending syndicate and revised certain covenants including those related to accounts receivable, Minimum Consolidated EBITDA requirements, Indebtedness, permitted Indebtedness and certain capital expenditure limits. Additionally, the amendments 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%. The amendments 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 amendments, 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 Company further amended its Senior Revolver agreement in April 2017 to adjust terms in the agreement to accommodate changes in its business. In March 2018, the Company amended its Senior Revolver to modify certain terms and requirements to account for the Company’s adoption of Topic 606. The Company amended its Senior Revolver again in December 2018. The amendment altered definitions and amended sections of the agreement to allow for transactions required to administer the convertible senior note financing. 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 the years ended December 31, 2018, 2017 and 2016, the Company borrowed an aggregate of $115,000, $105,000 and $84,000, respectively, under the Senior Revolver for general operating purposes and repaid an aggregate of $171,246, $89,000 and $74,000, respectively. As of December 31, 2018, there were no amounts outstanding under the Senior Revolver and the amount available to borrow was $77,264.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments 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 2019 and 2023. 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. Operating lease commitments include rent for land associated with the Company’s build-to-suit leases expiring through 2031. In December 2016, the Company amended its three leases for buildings on its Charleston, South Carolina campus. As a result, one lease, that was previously accounted for as an operating lease was classified as a capital lease at the end of 2016. Rent expense totaled $2,063, $1,605, and $4,403 for the years ended December 31, 2018, 2017, and 2016, respectively. Future minimum lease payments are as follows: Operating Leases Year Ending December 31, 2019 $ 1,350 2020 1,042 2021 999 2022 1,022 2023 1,046 Thereafter 7,514 Total minimum lease payments $ 12,973 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 3 to 5 years with interest rates ranging from 0.5% to 15.0%. 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, 2018, capital lease obligations include amounts under this lease of $20,325. Details of the lease extension are disclosed under “Contractual Commitments” below. Financing obligations were $37,544 and $34,233, as of December 31, 2018 and 2017, respectively, and consist primarily of obligations for build-to-suit lease arrangements. The aggregate amount of future minimum payments for financing obligations was $106,467 at December 31, 2018 which includes aggregate payments of $102,300 related to build-to-suit arrangements. Details of the build-to-suit lease arrangements are disclosed in Note 16. Financing obligations are allocated as follows: As of December 31, 2018 2017 Buildings, build-to-suit $ 33,814 $ 32,652 Software and support 3,730 1,581 Total financing obligations $ 37,544 $ 34,233 Less: current portion (1,678 ) (1,283 ) Financing obligations, net of current portion $ 35,866 $ 32,950 Future minimum lease payments are as follows: Capital Leases Financing Obligations Year Ending December 31, 2019 $ 5,542 $ 8,502 2020 3,777 8,166 2021 3,261 7,504 2022 3,089 7,278 2023 3,180 7,493 Thereafter 28,577 67,524 Total minimum lease and financing obligation payments 47,426 $ 106,467 Less: executory costs (5,147 ) Less: imputed interest (18,221 ) Less: current portion (2,808 ) Capital lease obligations, net of current portion $ 21,250 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 is being 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”). Through an extension by the landlord, the target commencement date of the lease is July 1, 2020 with a term of 15 years. Under the terms of the lease, the Company agrees to commence construction on or about April 1, 2019, 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, 2019, 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 $276 of non-cancellable contractual commitments as of December 31, 2018 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

Stock-based Compensation	12 Months Ended
	Dec. 31, 2018
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. Amended and Restated 2012 Stock Plan, (the “2012 Plan”), pursuant to which the Company has reserved 4,139,296 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, 2018, the Company had 1,731,799 shares allocated to the 2012 Plan, but not yet issued. The Company has issued two types of awards under these plans: stock options and restricted stock units (“RSUs”). The following table sets forth the number of awards outstanding for each award type is as follows: Outstanding at December 31, Award type 2018 2017 2016 Restricted stock units 2,174,250 1,937,014 1,467,811 Stock options 233,247 263,155 727,559 The grant date value of RSUs 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. 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. Generally, the Company issues previously unissued shares for the exercise of stock options or exchange of RSUs; however, previously acquired shares may be reissued to satisfy future issuances. The standard vesting period for RSU and option awards is over four years however vesting periods range from one to five years. Some RSUs vest immediately upon grant. 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. 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: 2018 2017 2016 Cost of revenue $ 5,164 $ 2,508 $ 2,799 Sales and marketing 6,764 4,953 3,212 Research and development 5,510 2,990 4,533 General and administrative 11,430 5,686 7,544 $ 28,868 $ 16,137 $ 18,088 The total compensation cost related to non-vested awards not yet recognized as of December 31, 2018 was $43,842 and will be recognized over a weighted-average period of approximately 2.59 years. Restricted Stock Units During 2018, the Company granted RSUs under the 2012 Plan. Restricted stock units granted to employees vest in equal annual installments over terms that range from immediate vesting at grant to 4 years. The fair value of the stock at the time of grant is amortized based on a straight-line basis over the vesting period. The summary of unvested restricted stock units is as follows: Restricted stock units Weighted average grant date fair value Unvested at December 31, 2017 1,937,014 $ 30.90 Granted 1,664,652 31.96 Forfeited (763,997 ) 29.38 Vested (663,419 ) 33.01 Unvested at December 31, 2018 2,174,250 $ 31.61 As of December 31, 2018, the number and intrinsic value of restricted stock units expected to vest was 2,015,771 and $92,161, respectively. The aggregate fair value of restricted stock units vested during the years ended December 31, 2018, 2017 and 2016 was $18,623, $12,137 and $10,311, respectively. Included in the grants of 2018 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 857,827 performance restricted stock units to officers and certain employees with an aggregate grant-date fair value of $28,589. The actual number of shares issued upon vesting could range from 0% to 100%. As of December 31, 2018, there were 818,975 performance restricted stock units outstanding with a weighted average grant-date fair value of $33.32 per unit, of which 650,190 units with a weighted average grant-date fair value of $33.26 per unit were expected to vest. Stock Options The following is a summary of the option activity for the year ended December 31, 2018: Number of Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Outstanding balance at December 31, 2017 263,155 $ 9.22 Granted - - Exercised (29,908 ) 6.22 Forfeited or expired - - Outstanding balance at December 31, 2018 233,247 $ 9.60 3.2 $ 8,425 Exercisable at December 31, 2018 233,247 $ 9.60 3.2 $ 8,425 Vested and expected to vest at December 31, 2018 233,247 $ 9.60 3.2 $ 8,425 The aggregate intrinsic value of employee options exercised during the years ended December 31, 2018, 2017, and 2016 was No stock options were granted during the years ended December 31, 2018, 2017 and 2016.

Stockholders' Deficit

Stockholders' Deficit	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
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. The Company maintains the Benefitfocus, Inc. 2016 Employee Stock Purchase Plan (“ESPP”) pursuant to which the Company has reserved 125,374 shares of its common stock for purchase by its employees who meet certain criteria. 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 acquisition 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. At December 31, 2018, the Company had reserved a total of 4,264,670 of its authorized 50,000,000 shares of common stock for future issuance as follows: Outstanding stock options 233,247 Restricted stock units 2,174,250 Available for future issuance under stock award plans 1,731,799 Available for future issuance under ESPP 125,374 Total common shares reserved for future issuance 4,264,670

Revenue

Revenue	12 Months Ended
	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Revenue	12. Revenue Disaggregation of Revenue The following tables provide information about disaggregation of revenue by service line and includes a reconciliation of disaggregated revenue with reportable segments: Year ended December 31, 2018 Employer Carrier Total Service line: Software services $ 129,643 $ 72,705 $ 202,348 Professional services 40,157 16,216 56,373 Total $ 169,800 $ 88,921 $ 258,721 Year ended December 31, 2017 Employer Carrier Total Service line: Software services $ 117,236 $ 67,655 $ 184,891 Professional services 36,245 15,706 51,951 Total $ 153,481 $ 83,361 $ 236,842 Year ended December 31, 2016 Employer Carrier Total Service line: Software services $ 117,342 $ 68,816 $ 186,158 Professional services 32,434 17,931 50,365 Total $ 149,776 $ 86,747 $ 236,523 Contract Balances The following table provides information about contract assets and contract liabilities from contracts with customers: Balance at Beginning of Period Balance at End of Period As of December 31, 2018 Contract assets $ 11,522 $ 12,798 Contract liabilities: Deferred revenue $ 55,027 $ 45,863 As of December 31, 2017 Contract assets $ 15,929 $ 11,522 Contract liabilities: Deferred revenue $ 56,949 $ 55,027 The Company recognizes payments from customers based on contractual billing schedules. Accounts receivable are recorded when the right to consideration becomes unconditional. Contract assets include amounts related to the Company’s contractual right to consideration for completed performance objectives not yet invoiced. Contract liabilities include payments received in advance of performance under the contract and are recognized as revenue when earned under the contract. The Company had no asset impairment charges related to contract assets during the years ended December 31, 2018 and 2017. Contract assets are largely comprised of unbilled software services revenue from insurance broker commissions. The performance obligation for this revenue is satisfied when the order is received. Amounts are recorded as accounts receivable when the right to consideration becomes unconditional which generally occurs over the period of underlying insurance policy. Payments from insurance broker commissions are typically received monthly in arrears. The following tables show the significant changes in contract asset balances: Year ended December 31, Contract Assets 2018 2017 Transferred to receivables from contract assets $ 20,560 $ 19,512 Revenue recognized from performance obligations satisfied but not billed $ 21,836 $ 15,106 Revenue recognized during the years ended December 31, 2018 and 2017 that was included in the deferred revenue balance at the beginning of the periods was $33,421 and $25,238, respectively. The Company recorded favorable transaction price adjustments to software services revenue from performance obligations satisfied or partially satisfied in previous periods of $1,161 during the year ended December 31, 2018. There were no such adjustments during the ended December 31, 2017. Performance Obligations As of December 31, 2018, the aggregate amount of the Company’s performance obligations that are unsatisfied or partially unsatisfied were approximately $216,000, of which a majority are expected to be satisfied within the next three years. The Company excludes from its population of performance obligations contracts with original durations of one year or less, contract renewal periods that renew automatically, and amounts of variable consideration that are allocated to wholly unsatisfied distinct service that forms part of a single performance obligation and meets certain variable allocation criteria.

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	13. 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, 2018, 2017 and 2016, 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 one year of service. During the years ended December 31, 2018, 2017, and 2016, employer matching contributions were $3,162, $3,020 and $2,649, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	14. 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 2014 through 2017 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: 2018 2017 2016 Federal $ - $ - $ - State and local 28 15 17 Total current expense $ 28 $ 15 $ 17 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: 2018 2017 2016 Federal statutory rate 21.0 % 34.0 % 34.0 % Effect of: State income taxes, net of federal benefit 10.3 % 6.6 % 6.0 % Change in state tax rates 1.7 % 0.4 % 2.6 % Change in federal tax rates 0.0 % (67.8 %) 0.0 % Change in valuation allowance (29.4 %) 24.3 % (46.3 %) State tax credits 0.3 % 0.4 % 4.0 % Stock-based compensation (2.2 %) 3.8 % (0.1 %) Section 162(m) (0.8 %) (1.2 %) 0.0 % Other permanent items (0.9 %) (0.5 %) (0.2 %) Deferred true-up 0.0 % 0.0 % 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: 2018 2017 Deferred tax assets relating to: Net operating loss carryforwards $ 82,057 $ 69,452 Deferred revenue 3,150 7,929 Commissions and incentive accrual 678 547 Deferred rent 433 471 State tax credits 7,936 7,866 Stock-based compensation 4,595 4,060 Compensation and other accruals - 2,539 Property and equipment and intangible assets 1,138 551 Interest limitation 968 - Total gross deferred tax assets 100,955 93,415 Deferred tax liabilities Compensation and other accruals $ (2,366 ) $ (4,322 ) Convertible debt (16,281 ) - Total gross deferred tax liabilities (18,647 ) (4,322 ) Deferred tax assets less liabilities 82,308 89,093 Less: valuation allowance (82,308 ) (89,093 ) Net deferred tax asset (liability) $ - $ - As of December 31, 2018 and 2017, the Company’s gross deferred tax was reduced by a valuation allowance of $82,308 and $89,093, respectively. The valuation allowance decreased by $6,785 and increased by $7,832 during the years ended December 31, 2018 and 2017, respectively. The valuation allowance decrease in 2018 resulted primarily from establishing deferred tax liabilities related to tax method changes and convertible debt issuance partially offset by changes in the deferred tax assets related to the net operating loss carryforwards. The increase in the valuation allowance in 2017 resulted primarily from changes in deferred tax assets partially offset by a decrease from the revaluation of the deferred tax assets and liabilities in connection with enactment of the Tax Cuts & Jobs Act (“Tax Reform”) on December 22, 2017. Among other things, the primary provision of Tax Reform impacting the Company is the reduction to the U.S. corporate income tax rate from 34% to 21%. The Company adopted the revenue accounting rules prescribed by Topic 606 in 2018 with an effective date of January 1, 2016. As a result of this adoption, the Company has restated its deferred tax assets related to net operating loss carryforwards for both federal and state income tax purposes along with the related offsetting valuation allowances. Net operating loss carryforwards for federal income tax purposes were approximately $287,686 and $253,946 at December 31, 2018 and 2017, respectively. State net operating loss carryforwards were $285,377 and $221,189 at December 31, 2018 and 2017, respectively. The federal and state net operating loss carryforwards will expire at various dates during 2019 through 2037, 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 $10,483 and $10,322 were available at December 31, 2018 and 2017, 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 2033. The Company follows FASB ASC 740-10 for accounting for unrecognized tax benefits. As of December 31, 2018, 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: 2018 2017 2016 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, 2018 and 2017, 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.

Segments and Geographic Informa

Segments and Geographic Information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segments and Geographic Information	15. 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, 2018 2017 2016 Revenue from external customers by segment: Employer $ 169,800 $ 153,481 $ 149,776 Carrier 88,921 83,361 86,747 Total net revenue from external customers $ 258,721 $ 236,842 $ 236,523 Depreciation and amortization by segment: Employer $ 10,232 $ 10,229 $ 8,116 Carrier 5,583 5,677 4,957 Total depreciation and amortization $ 15,815 $ 15,906 $ 13,073 Gross profit by segment Employer $ 75,397 $ 58,347 $ 61,951 Carrier 54,047 51,113 51,264 Total gross profit by segment $ 129,444 $ 109,460 $ 113,215 Substantially all assets were held and all revenue was generated in the United States during the years ended December 31, 2018, 2017 and 2016.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Parties	16. 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 one of the Company’s directors, significant stockholders, and executives as well as another significant stockholder 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 and as a capital lease in 2017 and after. 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 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. On December 12, 2016 and in conjunction with the lease amendments, the Company also executed a cancellable lease agreement with an entity with which one of the Company’s directors, significant stockholders, and executives as well as another significant stockholder 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”). Through an extension provided by the lessor, the target commencement date of the lease is July 1, 2020 with a term of 15 years. Under the terms of the lease, the Company agrees to commence construction on or about April 1, 2019, 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, 2019, 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 $10,659, $10,328, and $10,417 for the years ended December 31, 2018, 2017 and 2016, respectively. Amounts due to the related parties were recorded as $833 and $901 in accrued expenses in the accompanying consolidated balance sheets as of December 31, 2018 and 2017, respectively. Other Related Party Expenses The Company utilizes the services of various companies that are owned and controlled by an executive who is also a Company director and significant stockholder. The companies provide construction project management services, private air transportation and other services. Expenses related to these companies were $107, $20, and $80 for the years ended December 31, 2018, 2017 and 2016, respectively. No amounts were due to the related parties as of December 31, 2018 and 2017. During 2018, the Company entered into an agreement to purchase software and services from a company affiliated with a Company director. The aggregate amount of payments due under this contract is $115. Payments related to this agreement were $35 for the year ended December 31, 2018. Amounts due to this company were $35 as of December 31, 2018. Related Party Revenues The Company entered into a Stock Purchase Agreement with Mercer, a customer, on February 24, 2015 pursuant to which Mercer acquired 2,817,526 shares of the Company’s common stock and a warrant to purchase up to an additional 580,813 shares of the Company’s common stock. 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. On August 24, 2017, Mercer’s warrant to purchase common stock of the Company expired unexercised resulting in Mercer’s beneficial ownership of the Company falling below 10%. Accordingly, as of that date, the Company no longer considers Mercer a related party. As of December 31, 2018, Mercer beneficially owned 8.8% of the Company’s outstanding common stock. For the period January 1, 2017 to August 24, 2017, revenue from Mercer was $17,611. For the year ended December 31, 2016, revenue from Mercer was $27,663. Revenue from Mercer was reflected in “Revenues,” within the accompanying statements of operations. Related Party Revolving Line of Credit As disclosed in Note 8, the Company amended its Senior Revolver at various times in 2017 and 2018. 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 11.8% of the Company’s outstanding common stock as of December 31, 2018. 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%.

Selected Quarterly Financial Da

Selected Quarterly Financial Data (unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (unaudited)	17. 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, 2018 and 2017. Quarter Ended December 31, September 30, June 30, March 31, December 31, September 30, June 30, March 31, 2018 2018 2018 2018 2017 2017 2017 2017 Consolidated Statements of Operations Data: Revenue $ 74,771 $ 61,006 $ 60,581 $ 62,363 $ 67,879 $ 56,251 $ 55,089 $ 57,623 Gross profit 39,358 29,266 29,860 30,960 33,705 24,941 25,393 25,421 Total operating expenses 48,995 37,600 40,915 41,633 37,338 35,888 36,213 37,961 Operating loss (9,637 ) (8,334 ) (11,055 ) (10,673 ) (3,633 ) (10,947 ) (10,820 ) (12,540 ) Net loss $ (12,966 ) $ (11,598 ) $ (14,261 ) $ (13,802 ) $ (6,855 ) $ (14,006 ) $ (13,850 ) $ (15,583 ) Net loss per common share (a) $ (0.41 ) $ (0.36 ) $ (0.45 ) $ (0.44 ) $ (0.22 ) $ (0.45 ) $ (0.45 ) $ (0.51 ) Weighted-average common shares outstanding--basic and diluted 31,988,033 31,883,029 31,806,972 31,333,348 31,285,263 31,181,141 31,076,995 30,658,468 (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 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

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	18. Subsequent Events Business Combinations On February 25, 2019, the Company purchased certain operating assets and liabilities, intellectual property and intangible assets, including the workforce in place, from the commercial business of Connecture, Inc., for $24,000 in cash. This acquisition will add technology to potentially strengthen the Company’s platform, expand its customer reach and enhance the value the Company delivers to its carrier customers. The Company has not completed its purchase price allocation. Stock-Based Compensation During January 2019, the Company granted 35,284 restricted stock units to employees with an aggregate grant date fair value of $1,710. These restricted stock units generally vest in equal annual installments generally over 3 and 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 and February 2019, stock option exercises and vesting of restricted stock units resulted in the issuance of 23,121 shares of common stock.

Schedule II-Valuation and Quali

Schedule II-Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2018
Valuation And Qualifying Accounts [Abstract]
Schedule II-Valuation and Qualifying Accounts	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, 2018 $ 3,531 $ 138 $ 4,813 $ (4,898 ) $ 3,584 Year Ended December 31, 2017 $ 4,595 $ 75 $ 5,593 $ (6,732 ) $ 3,531 Year Ended December 31, 2016 $ 2,585 $ 667 $ 5,004 $ (3,661 ) $ 4,595 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, 2018 (2) $ 89,093 $ 15,444 $ (22,229 ) $ 82,308 Year Ended December 31, 2017 (3)(4) $ 81,261 $ 41,904 $ (34,072 ) $ 89,093 Year Ended December 31, 2016 (5) $ 63,252 $ 18,009 $ - $ 81,261 (1) Increase in valuation allowance is related to the generation of net operating losses and other deferred tax assets. (2) Decrease in valuation on allowances is related to adjustments to deferred revenue and convertible debt issuance. (3) Increase in valuation allowance is related to adoption of ASU 2016-09. (4) Decrease in valuation on allowances is related to the change in the enacted tax rule. (5) Beginning balance has been adjusted for the effects of adoption of Topic 606.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Principles of Consolidation	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	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 related reserves, 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	Revenue and Deferred Revenue The Company derives its revenues primarily from fees for software services and professional services sold to employers and insurance carriers. Revenues are recognized when control of these services is transferred to customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. Taxes collected from customers relating to services and remitted to governmental authorities are excluded from revenues. The Company determines revenue recognition through the following steps: • Identification of each contract with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, performance obligations are satisfied. Software Services Revenues Software services revenues primarily consist of monthly subscription fees paid to the Company by its employer and insurance carrier customers for access to, and usage of, cloud-based benefits software solutions for a specified contract term. Fees are generally charged based on the number of employees or subscribers with access to the solution. Software services revenue also includes certain other revenue which is generated from the value of policies or products enrolled in through the Company’s marketplace. Software services revenues are generally recognized on a ratable basis over the contract term beginning on the date the software services are made available to the customer. The Company’s software service contracts are generally three years for both carrier and employer customers. Revenue from insurance broker commissions and supplier transactions is recognized at a point in time when the orders for the policies are received and transferred to the insurance carrier or supplier, and is reduced by estimates for risks from collectability, policy cancellation and termination. Professional Services Revenues Professional services revenues primarily consist of fees related to the implementation of software products purchased by customers. Professional services typically include discovery, configuration and deployment, integration, testing, and training. Fees from consulting services, support services and training are also included in professional services revenue. Revenue from implementation services with customers in the Carrier segment are generally recognized over the contract term of the associated software services contract, including any extension periods representing a material right. In certain arrangements, the Company utilizes estimates of hours as a measure of progress to determine revenue. Revenues from implementation services with customers in the Employer segment are generally recognized as those services are performed. Revenues from support and training fees are recognized over the service period. Contracts with Multiple Performance Obligations Certain of the Company’s contracts with customers contain multiple performance obligations. For these contracts, the individual performance obligations are accounted for separately if they are distinct. The Company allocates the transaction price to the separate performance obligations based on their relative standalone selling prices. The Company determines the standalone selling prices based on its overall pricing objectives, taking into consideration market conditions and other factors, including the value of its contracts, the software services sold, customer size and complexity, and the number and types of users under the contracts. Practical Expedients Elected In addition to practical expedients disclosed elsewhere in the notes to consolidated financial statements, the Company has elected to use the practical expedient not to adjust the promised amount of consideration for the effects of a significant financing component for contracts in which the period between transferring a service to a customer and when the customer pays for that service is one year or less.
Contract Costs	Contract Costs The Company capitalizes costs to obtain contracts that are considered incremental and recoverable, such as sales commissions. Payments of sales commissions generally include multiple payments. The Company capitalizes only those payments made within an insignificant time from the contract inception, typically three months or less. Subsequent payments are expensed as incurred. The capitalized costs are amortized to sales and marketing expense over the estimated period of benefit of the asset, which is generally four to five years. The Company has elected to use the practical expedient to expense the costs to obtain a contract when the amortization period is less than one year. The balance of deferred costs related to obtaining contracts included in deferred contract costs and other non-current assets was $7,506 and $7,376 as of December 31, 2018 and 2017, respectively. Sales and marketing expense includes $4,217, $4,488 and $4,348 of amortization for the years ended December 31, 2018, 2017 and 2016, respectively. The Company capitalizes contract fulfillment costs directly associated with customer contracts that are not related to satisfying performance obligations. The costs are amortized to cost of revenue expense over the estimated period of benefit, which is generally five years. The balance of deferred fulfillment costs included in deferred contract costs and other non-current assets was $5,235 and $8,060 as of December 31, 2018 and 2017, respectively. Cost of revenue expense includes $3,480, $3,525 and $3,187 of amortization for the years ended December 31, 2018, 2017 and 2016, respectively.
Cost of Revenue	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 facilities and security costs, additional depreciation and amortization expense, and employee benefit costs, to cost of revenue based on headcount.
Cash and Cash Equivalents	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 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	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 12% of the total accounts receivable at December 31, 2017, and approximately 13%, 11% and 12% of total revenue for the year ended December 31, 2018, 2017 and 2016, respectively. The revenue is attributable to the Company’s Employer segment.
Accounts Receivable and Allowance for Doubtful Accounts and Returns	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 $392 and $654 as of December 31, 2018 and 2017, 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 $3,191 and $2,877 as of December 31, 2018 and 2017, respectively.
Property and Equipment and Capitalized Software Development Costs	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 are 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. 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 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.
Impairment of Long-Lived Assets and Goodwill	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 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 Company compares the fair value of a reporting unit to its carrying value. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of our reporting unit, an impairment loss is recorded equal to the difference. The Company has identified two reporting units, 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.
Debt Issuance Costs	Debt Issuance Costs Debt issuance costs related to the convertible senior note financing have been recorded as a reduction of the carrying amount of the debt and are amortized to interest expense using the effective interest method. Debt issuance costs related to the revolving line of credit have been recorded in other non-current assets and are amortized to interest expense over the remaining life of the agreement.
Financing Obligations	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 software licenses.
Advertising	Advertising The Company expenses advertising costs as they are incurred. Direct advertising costs for the years ended December 31, 2018, 2017 and 2016 were $391, $168 and $635, respectively.
Comprehensive Loss	Comprehensive Loss The Company’s net loss equals comprehensive loss for all periods presented.
Stock-Based Employee Compensation	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 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, prior to January 1, 2017, the recognition of stock-based compensation expense required 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. Starting January 1, 2017, the Company recognizes the effect of forfeitures as they occur. The recognition of stock-based compensation expense associated with performance-based restricted stock units requires the estimation of the probability of achieving performance measures. The Company adopted the guidance in Accounting Standards Update ("ASU") 2016-09, “Compensation - Stock Compensation (Topic 718) - Improvements to Employee Share-Based Payment Accounting,” on January 1, 2017. Under this ASU, entities are permitted to make an accounting policy election to either estimate forfeitures on share-based payment awards, as previously required, or to recognize forfeitures as they occur. The Company has elected to recognize forfeitures as they occur and the impact of that change in accounting policy has been recorded as a $391 cumulative effect adjustment to its accumulated deficit as of January 1, 2017.
Income Taxes	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. Income tax effects related to settlements of share-based payment awards are reported in earnings as an increase or decrease to income tax expense (benefit), net. Additionally, income tax-related cash flows resulting from share-based payments are reported as operating activities in the statement of cash flows.
Basic and Diluted Net Loss per Common Share	Basic and Diluted Net Loss per Common Share Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including outstanding stock options, outstanding warrants, common stock related to unvested restricted stock units and convertible senior notes to the extent dilutive, and common stock issuable pursuant to the ESPP. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-dilutive.
Recently Adopted Accounting Standards	Recent Accounting Pronouncements Recently Adopted Accounting Standards Goodwill Impairment In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2017-04, "Simplifying the Test for Goodwill Impairment." The ASU 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. The Company adopted this guidance for its goodwill impairment test performed as of October 31, 2018. Adoption did not have any impact on the Company’s consolidated financial statements. Cloud Computing Arrangements In August 2018, the FASB issued Accounting Standards Update (“ASU”) 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract.” The ASU allows companies to capitalize implementation costs incurred in a hosting arrangement that is a service contract over the term of the arrangement, including periods covered by renewal options that are reasonably certain to be exercised. The Company early adopted this standard on a prospective basis in the quarter ended September 30, 2018. There was no impact on the Company’s consolidated financial statements upon adoption. Revenue from Contracts with Customers On January 1, 2018, the Company adopted ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” applying the full retrospective transition method to all contracts that were not completed as of January 1, 2016, the initial date of application. The adoption of Topic 606 significantly affected the accounting for revenue from certain professional services in the Carrier segment and insurance broker commission revenue included in software services revenue in the Employer segment. Prior to the adoption of Topic 606, the Company recognized revenue from certain professional services in the Carrier segment over the customer relationship period. Under Topic 606, revenue from certain of these services are recognized over the contract term of the associated software services contract, including any extension periods representing a material right, which can be shorter than the customer relationship period. The financial statement impact of this change is a reduction to the deferred revenue balance as of the date of adoption. Also prior to the adoption of Topic 606, the Company recognized insurance broker commission revenue over the policy period. Under Topic 606, the revenue related to broker commissions is recognized when the performance obligation has been satisfied, which is when the orders for the policies are received and transferred to the insurance carrier. As a result, software services revenue from these arrangements in the Employer segment is recognized in the aggregate and earlier under Topic 606 in comparison to the previous treatment. The financial statement impact of this change is reductions to balances of deferred revenue and increases in contract asset balances reported in other non-current assets. Additionally, prior to the adoption of Topic 606, the Company recognized revenue from implementation services fees that are paid in advance in the Employer segment either when the associated software services are made available to the customer or over the customer relationship period. Under the new standard, revenue from these fees are recognized as the services are provided on a percentage of completion basis. The financial statement impact of this change is revenue from these fees being recognized sooner under the new standard. In connection with the adoption of Topic 606, the Company is required to capitalize costs associated with obtaining and fulfilling a contract. Contract assets recognized for costs to obtain a contract consist primarily of sales commissions associated with obtaining contracts in the Carrier segment. These assets are amortized to sales and marketing expense over the estimated period of benefit of the asset, which is generally four to five years. Contract assets recognized for costs to fulfill a contract consist primarily of internal costs related to implementing products in the Carrier segment. These assets are amortized to cost of revenue expense over the estimated period of benefit, which is generally five years. The Company used the practical expedient for contracts that were completed by January 1, 2016, the initial date of application of Topic 606, that allows for the use of the transaction price at the date the contract was completed for contracts restated in comparative reporting periods, rather than estimating the variable consideration amount in each comparative reporting period. The following tables show the amounts by which financial statement lines were affected by the adoption of Topic 606. As of December 31, 2017 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Balance Sheet: Accounts receivable, net $ 30,156 $ (65 ) $ 30,091 Contract, prepaid and other current assets 4,337 11,522 15,859 Deferred contract costs and other non-current assets 816 15,437 16,253 Accrued expenses 9,136 (26 ) 9,110 Deferred revenue, current portion 38,821 4,983 43,804 Deferred revenue, net of current portion 19,898 (8,675 ) 11,223 Additional paid-in capital 355,301 (2,805 ) 352,496 Accumulated deficit (394,663 ) 33,417 (361,246 ) Year Ended December 31, 2017 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Statement of Operations and Comprehensive Loss: Revenue $ 256,735 $ (19,893 ) $ 236,842 Cost of revenue 124,156 3,226 127,382 Sales and marketing 69,280 1,303 70,583 Loss from operations (13,518 ) (24,422 ) (37,940 ) Net loss and comprehensive loss (25,872 ) (24,422 ) (50,294 ) Net loss per common share: Basic and diluted $ (0.83 ) $ (0.79 ) $ (1.62 ) Year Ended December 31, 2016 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Statement of Operations and Comprehensive Loss: Revenue $ 233,335 $ 3,188 $ 236,523 Cost of revenue 120,681 2,627 123,308 Sales and marketing 55,488 823 56,311 Research and development 56,584 26 56,610 Loss from operations (32,168 ) (288 ) (32,456 ) Net loss and comprehensive loss (40,058 ) (288 ) (40,346 ) Net loss per common share: Basic and diluted $ (1.35 ) $ (0.01 ) $ (1.36 ) Cash provided by, or used in, operating, investing and financing activities were not affected by the adoption of Topic 606.
Accounting Standards Not Yet Adopted	Accounting Standards Not Yet Adopted In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement.” The ASU modifies the disclosure requirements required for fair value measurements. This ASU is effective for the Company for the interim and annual reporting periods starting January 1, 2020. Early adoption is permitted. The Company does not expect this guidance to have a material impact on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses (Topic 326): 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 starting January 1, 2020. The Company is currently evaluating the impact of this guidance 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. Topic 842 introduces new disclosure requirements for leasing arrangements and is effective for the Company beginning January 1, 2019. The Company will apply Topic 842 without presenting comparative period financial statements, thus will recognize a cumulative-effect adjustment to the opening balance of retained earnings as of January 1, 2019. The Company plans to utilize the following additional significant transition elections: • Elect the package of three practical expedients to not reassess: o whether any expired or existing contracts are or contain a lease; o the classification of any expired or existing leases; and o the treatment of initial direct costs. • Adopt a policy to not separate lease and associated nonlease components for all classes of assets. The Company will apply this policy to all existing leases on transition as well as new leases going forward. The Company is continuing to evaluate the effect of adoption of this standard on its consolidated financial statements. The Company expects its consolidated financial statements to be significantly affected by the following: • Assets and related financing obligations for the Company’s existing build-to-suit lease arrangements will be derecognized with a cumulative adjustment to retained earnings. These leases will be transitioned to the new standard based on a proforma analysis of the lease balances as of the transition date as if they had been a lease under ASC 840. Based on this analysis, the land component of these leases will be combined with the remainder of the lease obligation. Currently, this obligation is accounted for separately and recognized as part of facility expense. The following impacts are expected on the Company’s consolidated financial statements: o Operating expenses will increase as depreciation expense related to the buildings will increase as function of shortening the period of depreciation from the estimated life of the asset to the expected term of the lease. o Interest expense will decrease as a result of a discount rate that is lower than the rate required for build-to-suit accounting. • Lease liabilities and right-of-use, or ROU, assets related to existing operating lease obligations (including lease and associated non-lease components) will recorded on the balance sheet. • Lease liabilities and ROU assets will be recorded related to payment obligations for nonlease components (e.g. common area maintenance and equipment maintenance) associated with existing capital lease components. Total net cash flows will not be impacted by adoption of the new lease standard; however, classification of some transactions are expected to move between operating, investing and financing activities.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
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
Schedule of Impact on Financial Statements on Adoption of Topic 606	The following tables show the amounts by which financial statement lines were affected by the adoption of Topic 606. As of December 31, 2017 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Balance Sheet: Accounts receivable, net $ 30,156 $ (65 ) $ 30,091 Contract, prepaid and other current assets 4,337 11,522 15,859 Deferred contract costs and other non-current assets 816 15,437 16,253 Accrued expenses 9,136 (26 ) 9,110 Deferred revenue, current portion 38,821 4,983 43,804 Deferred revenue, net of current portion 19,898 (8,675 ) 11,223 Additional paid-in capital 355,301 (2,805 ) 352,496 Accumulated deficit (394,663 ) 33,417 (361,246 ) Year Ended December 31, 2017 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Statement of Operations and Comprehensive Loss: Revenue $ 256,735 $ (19,893 ) $ 236,842 Cost of revenue 124,156 3,226 127,382 Sales and marketing 69,280 1,303 70,583 Loss from operations (13,518 ) (24,422 ) (37,940 ) Net loss and comprehensive loss (25,872 ) (24,422 ) (50,294 ) Net loss per common share: Basic and diluted $ (0.83 ) $ (0.79 ) $ (1.62 ) Year Ended December 31, 2016 Financial Statement Line Item As previously reported Adjustments As adjusted Consolidated Statement of Operations and Comprehensive Loss: Revenue $ 233,335 $ 3,188 $ 236,523 Cost of revenue 120,681 2,627 123,308 Sales and marketing 55,488 823 56,311 Research and development 56,584 26 56,610 Loss from operations (32,168 ) (288 ) (32,456 ) Net loss and comprehensive loss (40,058 ) (288 ) (40,346 ) Net loss per common share: Basic and diluted $ (1.35 ) $ (0.01 ) $ (1.36 )

Net Loss Per Common Share (Tabl

Net Loss Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2018
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 2018 2017 2016 Restricted stock units 2,174,250 1,937,014 1,467,811 Stock options 233,247 263,155 727,559 Convertible senior notes 4,513,824 - - Warrant to purchase common stock - - 580,813 Employee Stock Purchase Plan - 7,039 3,964 Total anti-dilutive common share equivalents 6,921,321 2,207,208 2,780,147
Basic and Diluted Net Loss per Common Share	Basic and diluted net loss per common share is calculated as follows: Year Ended December 31, 2018 2017 2016 Numerator: Net loss $ (52,627 ) $ (50,294 ) $ (40,346 ) Net loss attributable to common stockholders $ (52,627 ) $ (50,294 ) $ (40,346 ) Denominator: Weighted-average common shares outstanding, basic and diluted 31,756,415 31,052,378 29,589,857 Net loss per common share, basic and diluted $ (1.66 ) $ (1.62 ) $ (1.36 )

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	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, 2018 and 2017. December 31, 2018 Description Level 1 Level 2 Level 3 Total Cash Equivalents: Money market mutual funds (1) $ 182,748 $ - $ - $ 182,748 Total assets $ 182,748 $ - $ - $ 182,748 December 31, 2017 Description Level 1 Level 2 Level 3 Total Cash Equivalents: Money market mutual funds (1) $ 46,730 $ - $ - $ 46,730 Total assets $ 46,730 $ - $ - $ 46,730 (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.

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Property and Equipment	Property and equipment consists of the following as of December 31: 2018 2017 Buildings, leased $ 48,558 $ 48,558 Computers and related equipment 38,183 35,728 Purchased software and licenses 30,702 27,317 Developed software 36,713 30,624 Furniture and fixtures 6,773 6,669 Leasehold improvements 4,633 4,289 Other equipment 2,313 2,260 Vehicles 146 146 Total property and equipment, at cost 168,021 155,591 Accumulated depreciation and amortization (98,056 ) (82,910 ) Property and equipment, net $ 69,965 $ 72,681

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Remaining Useful Life (in years) Trademarks $ 240 $ (240 ) $ - - Customer agreements 2,060 (2,060 ) - - Non-compete agreements 126 (126 ) - - Total $ 2,426 $ (2,426 ) $ - - As of December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Remaining Useful Life (in years) Trademarks $ 240 $ (240 ) $ - - Customer agreements 2,060 (1,910 ) 150 0.6 Non-compete agreements 126 (126 ) - - Total $ 2,426 $ (2,276 ) $ 150 0.6

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Convertible Notes	The Notes consist of the following as of December 31: 2018 2017 Liability Component: Principal $ 240,000 $ - Less: debt discount, net of amortization (63,308 ) - Net carrying amount $ 176,692 $ - Equity component (a) 56,950 -
Summary of Recognized Interest Expense	The following table sets forth total interest expense recognized related to the Notes: Year Ended December 31, 2018 2017 1.25% coupon $ 42 $ - Amortization of debt discount and transaction costs - - $ 42 $ -
Schedule of Fair Value and Carrying Value of Convertible Senior Notes	As of December 31, 2018, the fair value of the Notes, which was determined based on inputs that are observable in the market or that could be derived from, or corroborated with, observable market data, quoted price of the Notes in an over-the-counter market (Level 2), and carrying value of debt instruments (carrying value excludes the equity component of the Company’s convertible notes classified in equity) were as follows: December 31, 2018 December 31, 2017 Fair Value Carrying Value Fair Value Carrying Value Convertible senior notes $ 254,400 $ 176,692 $ - $ -

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Operating Lease Payments	Future minimum lease payments are as follows: Operating Leases Year Ending December 31, 2019 $ 1,350 2020 1,042 2021 999 2022 1,022 2023 1,046 Thereafter 7,514 Total minimum lease payments $ 12,973
Financing Obligations	Financing obligations are allocated as follows: As of December 31, 2018 2017 Buildings, build-to-suit $ 33,814 $ 32,652 Software and support 3,730 1,581 Total financing obligations $ 37,544 $ 34,233 Less: current portion (1,678 ) (1,283 ) Financing obligations, net of current portion $ 35,866 $ 32,950
Future Minimum Lease Payments	Future minimum lease payments are as follows: Capital Leases Financing Obligations Year Ending December 31, 2019 $ 5,542 $ 8,502 2020 3,777 8,166 2021 3,261 7,504 2022 3,089 7,278 2023 3,180 7,493 Thereafter 28,577 67,524 Total minimum lease and financing obligation payments 47,426 $ 106,467 Less: executory costs (5,147 ) Less: imputed interest (18,221 ) Less: current portion (2,808 ) Capital lease obligations, net of current portion $ 21,250

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Awards Outstanding	The Company has issued two types of awards under these plans: stock options and restricted stock units (“RSUs”). The following table sets forth the number of awards outstanding for each award type is as follows: Outstanding at December 31, Award type 2018 2017 2016 Restricted stock units 2,174,250 1,937,014 1,467,811 Stock options 233,247 263,155 727,559
Compensation Expense Related to Stock Options	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: 2018 2017 2016 Cost of revenue $ 5,164 $ 2,508 $ 2,799 Sales and marketing 6,764 4,953 3,212 Research and development 5,510 2,990 4,533 General and administrative 11,430 5,686 7,544 $ 28,868 $ 16,137 $ 18,088
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, 2017 1,937,014 $ 30.90 Granted 1,664,652 31.96 Forfeited (763,997 ) 29.38 Vested (663,419 ) 33.01 Unvested at December 31, 2018 2,174,250 $ 31.61
Summary of Option Activity	The following is a summary of the option activity for the year ended December 31, 2018: Number of Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Outstanding balance at December 31, 2017 263,155 $ 9.22 Granted - - Exercised (29,908 ) 6.22 Forfeited or expired - - Outstanding balance at December 31, 2018 233,247 $ 9.60 3.2 $ 8,425 Exercisable at December 31, 2018 233,247 $ 9.60 3.2 $ 8,425 Vested and expected to vest at December 31, 2018 233,247 $ 9.60 3.2 $ 8,425

Stockholders' Deficit (Tables)

Stockholders' Deficit (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Shares of Common Stock Reserved for Future Issuance	At December 31, 2018, the Company had reserved a total of 4,264,670 of its authorized 50,000,000 shares of common stock for future issuance as follows: Outstanding stock options 233,247 Restricted stock units 2,174,250 Available for future issuance under stock award plans 1,731,799 Available for future issuance under ESPP 125,374 Total common shares reserved for future issuance 4,264,670

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Summary of Disaggregation of Revenue by Service Line with Reportable Segments	The following tables provide information about disaggregation of revenue by service line and includes a reconciliation of disaggregated revenue with reportable segments: Year ended December 31, 2018 Employer Carrier Total Service line: Software services $ 129,643 $ 72,705 $ 202,348 Professional services 40,157 16,216 56,373 Total $ 169,800 $ 88,921 $ 258,721 Year ended December 31, 2017 Employer Carrier Total Service line: Software services $ 117,236 $ 67,655 $ 184,891 Professional services 36,245 15,706 51,951 Total $ 153,481 $ 83,361 $ 236,842 Year ended December 31, 2016 Employer Carrier Total Service line: Software services $ 117,342 $ 68,816 $ 186,158 Professional services 32,434 17,931 50,365 Total $ 149,776 $ 86,747 $ 236,523
Summary of Contract Assets and Contract Liabilities	The following table provides information about contract assets and contract liabilities from contracts with customers: Balance at Beginning of Period Balance at End of Period As of December 31, 2018 Contract assets $ 11,522 $ 12,798 Contract liabilities: Deferred revenue $ 55,027 $ 45,863 As of December 31, 2017 Contract assets $ 15,929 $ 11,522 Contract liabilities: Deferred revenue $ 56,949 $ 55,027
Summary of Significant Changes in Contract Asset Balances	The following tables show the significant changes in contract asset balances: Year ended December 31, Contract Assets 2018 2017 Transferred to receivables from contract assets $ 20,560 $ 19,512 Revenue recognized from performance obligations satisfied but not billed $ 21,836 $ 15,106

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
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: 2018 2017 2016 Federal $ - $ - $ - State and local 28 15 17 Total current expense $ 28 $ 15 $ 17 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	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: 2018 2017 2016 Federal statutory rate 21.0 % 34.0 % 34.0 % Effect of: State income taxes, net of federal benefit 10.3 % 6.6 % 6.0 % Change in state tax rates 1.7 % 0.4 % 2.6 % Change in federal tax rates 0.0 % (67.8 %) 0.0 % Change in valuation allowance (29.4 %) 24.3 % (46.3 %) State tax credits 0.3 % 0.4 % 4.0 % Stock-based compensation (2.2 %) 3.8 % (0.1 %) Section 162(m) (0.8 %) (1.2 %) 0.0 % Other permanent items (0.9 %) (0.5 %) (0.2 %) Deferred true-up 0.0 % 0.0 % 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: 2018 2017 Deferred tax assets relating to: Net operating loss carryforwards $ 82,057 $ 69,452 Deferred revenue 3,150 7,929 Commissions and incentive accrual 678 547 Deferred rent 433 471 State tax credits 7,936 7,866 Stock-based compensation 4,595 4,060 Compensation and other accruals - 2,539 Property and equipment and intangible assets 1,138 551 Interest limitation 968 - Total gross deferred tax assets 100,955 93,415 Deferred tax liabilities Compensation and other accruals $ (2,366 ) $ (4,322 ) Convertible debt (16,281 ) - Total gross deferred tax liabilities (18,647 ) (4,322 ) Deferred tax assets less liabilities 82,308 89,093 Less: valuation allowance (82,308 ) (89,093 ) 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: 2018 2017 2016 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 Infor_2

Segments and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segments and Geographic Information	Year Ended December 31, 2018 2017 2016 Revenue from external customers by segment: Employer $ 169,800 $ 153,481 $ 149,776 Carrier 88,921 83,361 86,747 Total net revenue from external customers $ 258,721 $ 236,842 $ 236,523 Depreciation and amortization by segment: Employer $ 10,232 $ 10,229 $ 8,116 Carrier 5,583 5,677 4,957 Total depreciation and amortization $ 15,815 $ 15,906 $ 13,073 Gross profit by segment Employer $ 75,397 $ 58,347 $ 61,951 Carrier 54,047 51,113 51,264 Total gross profit by segment $ 129,444 $ 109,460 $ 113,215

Selected Quarterly Financial _2

Selected Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017. Quarter Ended December 31, September 30, June 30, March 31, December 31, September 30, June 30, March 31, 2018 2018 2018 2018 2017 2017 2017 2017 Consolidated Statements of Operations Data: Revenue $ 74,771 $ 61,006 $ 60,581 $ 62,363 $ 67,879 $ 56,251 $ 55,089 $ 57,623 Gross profit 39,358 29,266 29,860 30,960 33,705 24,941 25,393 25,421 Total operating expenses 48,995 37,600 40,915 41,633 37,338 35,888 36,213 37,961 Operating loss (9,637 ) (8,334 ) (11,055 ) (10,673 ) (3,633 ) (10,947 ) (10,820 ) (12,540 ) Net loss $ (12,966 ) $ (11,598 ) $ (14,261 ) $ (13,802 ) $ (6,855 ) $ (14,006 ) $ (13,850 ) $ (15,583 ) Net loss per common share (a) $ (0.41 ) $ (0.36 ) $ (0.45 ) $ (0.44 ) $ (0.22 ) $ (0.45 ) $ (0.45 ) $ (0.51 ) Weighted-average common shares outstanding--basic and diluted 31,988,033 31,883,029 31,806,972 31,333,348 31,285,263 31,181,141 31,076,995 30,658,468 (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 Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)ReportingUnit	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2017USD ($)	Dec. 31, 2015USD ($)
Summary Of Significant Accounting Policies [Line Items]
Contract cost payments, description	The Company capitalizes only those payments made within an insignificant time from the contract inception, typically three months or less. Subsequent payments are expensed as incurred. The capitalized costs are amortized to sales and marketing expense over the estimated period of benefit of the asset, which is generally four to five years. The Company has elected to use the practical expedient to expense the costs to obtain a contract when the amortization period is less than one year.
Deferred contract costs and other non-current assets	$ 13,668	$ 16,253
Allowance for doubtful accounts	$ 392	654
Number of reporting units | ReportingUnit	2
Advertising costs	$ 391	168	$ 635
Accounting Standards Update 2016-09
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment to accumulated deficit		0		$ 391
Accounting Standards Update ("ASU") 2014-09
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment to accumulated deficit					$ 55,322
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	$ 3,191	$ 2,877
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage		12.00%
Customer Concentration Risk | Total Revenue | Employer
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	13.00%	11.00%	12.00%
Sales and Marketing Expense
Summary Of Significant Accounting Policies [Line Items]
Deferred contract costs and other non-current assets	$ 7,506	$ 7,376
Amortization of contract costs	$ 4,217	4,488	$ 4,348
Cost of Revenue
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period of contract costs	5 years
Deferred contract costs and other non-current assets	$ 5,235	8,060
Amortization of contract costs	$ 3,480	$ 3,525	$ 3,187
Cost of Revenue | Accounting Standards Update ("ASU") 2014-09
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period of contract costs	5 years
Minimum | Sales and Marketing Expense
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period of contract costs	4 years
Minimum | Sales and Marketing Expense | Accounting Standards Update ("ASU") 2014-09
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period of contract costs	4 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Cash equivalents maturity period	3 months
Highly rated marketable securities	2 years
Weighted average maturity of portfolio of investments	9 months
Maximum | Sales and Marketing Expense
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period of contract costs	5 years
Maximum | Sales and Marketing Expense | Accounting Standards Update ("ASU") 2014-09
Summary Of Significant Accounting Policies [Line Items]
Estimated amortization period of contract costs	5 years

Estimated Useful Lives for Sign

Estimated Useful Lives for Significant Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2018
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

Impact on Consolidated Balance

Impact on Consolidated Balance Sheet on Adoption of Topic 606 (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net	$ 21,077	$ 30,091
Contract, prepaid and other current assets	16,667	15,859
Deferred contract costs and other non-current assets	13,668	16,253
Accrued expenses	11,461	9,110
Deferred revenue, current portion	36,540	43,804
Deferred revenue, net of current portion	9,323	11,223
Additional paid-in capital	403,631	352,496
Accumulated deficit	$ (413,873)	(361,246)
Accounting Standards Update ("ASU") 2014-09 | As Previously Reported
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net		30,156
Contract, prepaid and other current assets		4,337
Deferred contract costs and other non-current assets		816
Accrued expenses		9,136
Deferred revenue, current portion		38,821
Deferred revenue, net of current portion		19,898
Additional paid-in capital		355,301
Accumulated deficit		(394,663)
Accounting Standards Update ("ASU") 2014-09 | Adjustments
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net		(65)
Contract, prepaid and other current assets		11,522
Deferred contract costs and other non-current assets		15,437
Accrued expenses		(26)
Deferred revenue, current portion		4,983
Deferred revenue, net of current portion		(8,675)
Additional paid-in capital		(2,805)
Accumulated deficit		$ 33,417

Impact on Consolidated Statemen

Impact on Consolidated Statement of Operations and Comprehensive Loss on Adoption of Topic 606 (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue																	$ 258,721	$ 236,842	$ 236,523
Cost of revenue																		127,382	123,308
Sales and marketing																	78,179	70,583	56,311
Research and development																	47,902	49,549	56,610
Loss from operations	$ (9,637)		$ (8,334)		$ (11,055)		$ (10,673)		$ (3,633)		$ (10,947)		$ (10,820)		$ (12,540)		$ (39,699)	(37,940)	(32,456)
Net loss and comprehensive loss																		$ (50,294)	$ (40,346)
Basic and diluted	$ (0.41)	[1]	$ (0.36)	[1]	$ (0.45)	[1]	$ (0.44)	[1]	$ (0.22)	[1]	$ (0.45)	[1]	$ (0.45)	[1]	$ (0.51)	[1]	$ (1.66)	$ (1.62)	$ (1.36)
Accounting Standards Update ("ASU") 2014-09 | As Previously Reported
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue																		$ 256,735	$ 233,335
Cost of revenue																		124,156	120,681
Sales and marketing																		69,280	55,488
Research and development																			56,584
Loss from operations																		(13,518)	(32,168)
Net loss and comprehensive loss																		$ (25,872)	$ (40,058)
Basic and diluted																		$ (0.83)	$ (1.35)
Accounting Standards Update ("ASU") 2014-09 | Adjustments
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue																		$ (19,893)	$ 3,188
Cost of revenue																		3,226	2,627
Sales and marketing																		1,303	823
Research and development																			26
Loss from operations																		(24,422)	(288)
Net loss and comprehensive loss																		$ (24,422)	$ (288)
Basic and diluted																		$ (0.79)	$ (0.01)
[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.

Common Share Equivalents Securi

Common Share Equivalents Securities Excluded From Calculation of Weighted Average Common Share Outstanding (Detail) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	6,921,321	2,207,208	2,780,147
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	2,174,250	1,937,014	1,467,811
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	233,247	263,155	727,559
Convertible Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	4,513,824	0	0
Warrant to Purchase Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	0	0	580,813
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common share equivalents	0	7,039	3,964

Net Loss Per Common Share - Add

Net Loss Per Common Share - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Payment for capped call option agreemnt	$ 33,024	$ 0	$ 0

Basic and Diluted Net Loss per

Basic and Diluted Net Loss per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net loss	$ (12,966)		$ (11,598)		$ (14,261)		$ (13,802)		$ (6,855)		$ (14,006)		$ (13,850)		$ (15,583)		$ (52,627)	$ (50,294)	$ (40,346)
Net loss attributable to common stockholders																	$ (52,627)	$ (50,294)	$ (40,346)
Denominator:
Weighted-average common shares outstanding, basic and diluted	31,988,033		31,883,029		31,806,972		31,333,348		31,285,263		31,181,141		31,076,995		30,658,468		31,756,415	31,052,378	29,589,857
Net loss per common share, basic and diluted	$ (0.41)	[1]	$ (0.36)	[1]	$ (0.45)	[1]	$ (0.44)	[1]	$ (0.22)	[1]	$ (0.45)	[1]	$ (0.45)	[1]	$ (0.51)	[1]	$ (1.66)	$ (1.62)	$ (1.36)
[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.

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		$ 182,748	$ 46,730
Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	182,748	46,730
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		182,748	46,730
Level 1 | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	182,748	46,730
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		0	0
Level 2 | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		0	0
Level 3 | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	$ 0	$ 0
[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.

Property and Equipment (Detail)

Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 168,021	$ 155,591
Accumulated depreciation and amortization	(98,056)	(82,910)
Property and equipment, net	69,965	72,681
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,558	48,558
Computers and Related Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	38,183	35,728
Purchased Software and Licenses
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,702	27,317
Developed software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	36,713	30,624
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,773	6,669
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,633	4,289
Other Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,313	2,260
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 146	$ 146

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 15,815	$ 15,906	$ 13,073
Fixed assets acquired under capital lease	31,148	35,761
Accumulated depreciation of assets under capital leases	6,216	9,633
Capitalized software cost gross	6,090	4,482
Amortization of capitalized software cost	3,944	3,257	2,857
Capitalized software cost net	9,806	7,660
Property and Equipment
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 15,665	$ 15,648	$ 12,816

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	150,000	258,000	$ 257,000
Impairment of intangible assets	$ 0	$ 0	$ 0

Acquisition-Related Intangible

Acquisition-Related Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,426	$ 2,426
Accumulated Amortization	(2,426)	(2,276)
Net Carrying Amount	$ 0	$ 150
Weighted- Average Remaining Useful Life (in years)	0 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	$ (2,060)	(1,910)
Net Carrying Amount		$ 150
Weighted- Average Remaining Useful Life (in years)	0 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

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)sharesDay$ / shares	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Purchase of convertible note capped call hedge	$ 33,024
Common Stock
Debt Instrument [Line Items]
Purchase of convertible note capped call hedge	$ 0
Closing price of our common stock | $ / shares	$ 45.72
1.25% Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	$ 240,000	$ 0
Debt instrument, interest rate	1.25%
Debt instrument, maturity date	Dec. 15, 2023
Initial effective conversion price of debt instrument | $ / shares	$ 1
Consecutive trading period | Day	5
Interest rate conversion notes	7.30%
Fair value of the liability conversion notes	$ 181,500
Gross proceeds received from issuance of the notes	240,000
Difference between gross proceeds received from issuance of the notes and estimated fair value of notes	58,500
Transaction costs attributable to the liability component	4,808
Transaction costs attributable to the equity component	$ 1,550
1.25% Convertible Senior Notes | Call Option
Debt Instrument [Line Items]
Initial strike price | $ / shares	53.17
Cap price | $ / shares	89.98
Purchase of convertible note capped call hedge	$ 33,024
1.25% Convertible Senior Notes | Maximum
Debt Instrument [Line Items]
Conversion price percentage	1.30
Percent of Senior notes Principal amount to trigger Conversion as product of stock price and conversion rate	98.00%
1.25% Convertible Senior Notes | Common Stock
Debt Instrument [Line Items]
Debt instrument, conversion ratio	18.8076
Initial effective conversion price of debt instrument | $ / shares	$ 53.17
Number shares issuable upon conversion | shares	4,513,824

Schedule of Convertible Notes (

Schedule of Convertible Notes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Equity component (a)	$ 56,950
1.25% Convertible Senior Notes
Debt Instrument [Line Items]
Principal	240,000	$ 0
Less: debt discount, net of amortization	(63,308)	0
Net carrying amount	176,692	0
Equity component (a)	$ 56,950	$ 0

Schedule of Convertible Notes_2

Schedule of Convertible Notes (Parathetical) (Detail) - 1.25% Convertible Senior Notes $ in Thousands	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Transaction costs attributable to the equity component	$ 1,550
Additional Paid-in Capital
Debt Instrument [Line Items]
Transaction costs attributable to the equity component	$ 1,550

Summary of Recognized Interest

Summary of Recognized Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Interest expense	$ 5,685	$ 4,931	$ 1,095
1.25% Convertible Senior Notes
Debt Instrument [Line Items]
1.25% coupon	42	0
Amortization of debt discount and transaction costs	0	0
Interest expense	$ 42	$ 0

Schedule of Fair Value and Carr

Schedule of Fair Value and Carrying Value of Convertible Senior Notes (Detail) - 1.25% Convertible Senior Notes - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Fair Value	$ 254,400	$ 0
Carrying Value	$ 176,692	$ 0

Revolving Line of Credit - Addi

Revolving Line of Credit - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2016	Feb. 28, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Line Of Credit Facility [Line Items]
Proceeds from line of credit borrowing			$ 115,000,000	$ 105,000,000	$ 84,000,000
Payments on revolving line of credit			171,246,000	89,000,000	74,000,000
Hardware And Software
Line Of Credit Facility [Line Items]
Proceeds from line of credit borrowing			115,000,000	105,000,000	84,000,000
Payments on revolving line of credit			171,246,000	$ 89,000,000	$ 74,000,000
Senior Revolving Line of Credit
Line Of Credit Facility [Line Items]
Debt issuance fees capitalized	$ 379,000	$ 591,000
Line of credit facility maximum borrowing capacity	$ 95,000,000	$ 60,000,000
Line of credit facility, expiration period		3 years
Line of credit facility expiration date	Feb. 20, 2020
Amount outstanding under credit facility			0
Amount available to borrow under line of credit			$ 77,264,000
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 -

Commitments and Contingencies - Additional Information (Detail)	Dec. 31, 2016USD ($)Building	Dec. 12, 2016ft²Lease_AgreementsOption$ / ft²	Dec. 31, 2018USD ($)ft²BuildingLease_Agreements	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)Building	Dec. 31, 2013USD ($)
Commitments And Contingencies Disclosure [Line Items]
Number of buildings leased | Building	3		3		3
Rent for land leases expiration year			2,031
Lease yearly expenses			$ 2,063,000	$ 1,605,000	$ 4,403,000
Operating lease renewal option term	15 years				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		5,147,000		$ 5,938,000
Capital lease obligation			20,325,000
Software and maintenance
Commitments And Contingencies Disclosure [Line Items]
Financing obligation			276,000
Lease and financing arrangement
Commitments And Contingencies Disclosure [Line Items]
Financing obligation			37,544,000	34,233,000
Financing Obligation
Commitments And Contingencies Disclosure [Line Items]
Financing obligation			106,467,000
Headquarters building, build-to-suit | Lease and financing arrangement
Commitments And Contingencies Disclosure [Line Items]
Financing obligation			33,814,000	$ 32,652,000
Headquarters building, build-to-suit | Financing Obligation
Commitments And Contingencies Disclosure [Line Items]
Financing obligation			$ 102,300,000
Minimum
Commitments And Contingencies Disclosure [Line Items]
Operating lease expiration year			2,019
Minimum | Property and Equipment
Commitments And Contingencies Disclosure [Line Items]
Capital lease agreement period			3 years
Interest rate under lease agreement			0.50%
Maximum
Commitments And Contingencies Disclosure [Line Items]
Operating lease expiration year			2,023
Maximum | Property and Equipment
Commitments And Contingencies Disclosure [Line Items]
Capital lease agreement period			5 years
Interest rate under lease agreement			15.00%
Capital Lease
Commitments And Contingencies Disclosure [Line Items]
Number of buildings leased | Building	1		1		1
Build to Suit and Failed Sale Leaseback
Commitments And Contingencies Disclosure [Line Items]
Number of buildings leased | Building			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	3
Extended leases, expiration date			Dec. 31, 2031
Area of building, lessor to build | ft²			18,500
Waived accrued and future carrying costs and termination fees payable			$ 1,223,000
Percentage of annual rent increase			3.00%
Reduced percentage of annual rent increase contingent upon construction of building			2.00%
Area of building (in square foot) | ft²			145,800
Lease first occupied date			Jan. 1, 2015
Carrying and termination fees amortization period			15 years
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
Extended lease commencement date		Jul. 1, 2020
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

Future Minimum Operating Lease Payments (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,019	$ 1,350
2,020	1,042
2,021	999
2,022	1,022
2,023	1,046
Thereafter	7,514
Total minimum lease payments	$ 12,973

Financing Obligations (Detail)

Financing Obligations (Detail) - Lease and financing arrangement - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Contractual Obligation [Line Items]
Financing obligations	$ 37,544	$ 34,233
Less: current portion	(1,678)	(1,283)
Financing obligations, net of current portion	35,866	32,950
Headquarters building, build-to-suit
Contractual Obligation [Line Items]
Financing obligations	33,814	32,652
Software and Support
Contractual Obligation [Line Items]
Financing obligations	$ 3,730	$ 1,581

Future Minimum Lease Payments (

Future Minimum Lease Payments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Capital Leases
2,019	$ 5,542
2,020	3,777
2,021	3,261
2,022	3,089
2,023	3,180
Thereafter	28,577
Total minimum lease payments	47,426
Less: executory costs	(5,147)		$ (5,938)
Less: imputed interest	(18,221)
Less: current portion	(4,486)	$ (3,423)
Capital lease obligations, net of current portion	21,250
Financing Obligations
Executory costs	5,147		$ 5,938
Financing Obligation
Financing Obligations
2,019	8,502
2,020	8,166
2,021	7,504
2,022	7,278
2,023	7,493
Thereafter	67,524
Total minimum lease and financing obligation payments	106,467
Capital Lease Obligations
Capital Leases
Less: current portion	$ (2,808)

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common shares reserved for issuance under stock plans				4,139,296
Total compensation cost related to nonvested awards not yet recognized	$ 43,842
Total compensation cost related to nonvested awards not yet recognized period	2 years 7 months 2 days
Number of restricted stock units expected to vest	2,015,771
Intrinsic value of restricted stock units expected to vest	$ 92,161
Aggregate fair value of restricted stock units vested	$ 18,623	$ 12,137	$ 10,311
Number of restricted stock units outstanding	2,174,250	1,937,014	1,467,811
Restricted stock units, aggregate grant date fair value	$ 31.96
Number of restricted stock units, granted	1,664,652
Aggregate intrinsic value of employee options exercised	$ 915	$ 10,829	$ 21,117
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]
Number of restricted stock units outstanding	818,975
Restricted stock units, aggregate grant date fair value	$ 33.32
Number of restricted stock units, granted	650,190
Restricted stock units, aggregate grant date fair value	$ 33.26
Performance Based Restricted Stock Units R S Us | Vest on December 31,2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock units, granted	857,827
Restricted stock units, aggregate grant date fair value	$ 28,589
Performance Based Restricted Stock Units R S Us | Vest on December 31,2019 | 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 31,2019 | 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	1,731,799
Stock plan vesting period	4 years
Stock plan expiration period from grant date	10 years
2012 Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock plan vesting period	1 year
2012 Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock plan vesting period	5 years

Number of Awards Outstanding (D

Number of Awards Outstanding (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Restricted stock units	2,174,250	1,937,014	1,467,811
Stock options	233,247	263,155	727,559

Compensation Expense Related to

Compensation Expense Related to Stock Options (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 28,868	$ 16,137	$ 18,088
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	5,164	2,508	2,799
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	6,764	4,953	3,212
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	5,510	2,990	4,533
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense	$ 11,430	$ 5,686	$ 7,544

Summary of Unvested Restricted

Summary of Unvested Restricted Stock Units Activity (Detail)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Restricted stock units
Restricted stock units, beginning balance | shares	1,937,014
Restricted stock units, granted | shares	1,664,652
Restricted stock units, Forfeited | shares	(763,997)
Restricted stock units, Vested | shares	(663,419)
Restricted stock units, ending balance | shares	2,174,250
Weighted average grant date fair value
Weighted average grant date fair value, beginning balance | $ / shares	$ 30.90
Weighted average grant date fair value, granted | $ / shares	31.96
Weighted average grant date fair value, Forfeited | $ / shares	29.38
Weighted average grant date fair value, Vested | $ / shares	33.01
Weighted average grant date fair value, ending balance | $ / shares	$ 31.61

Summary of Option Activity (Det

Summary of Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock options
Beginning Balance	263,155	727,559
Granted	0	0	0
Exercised	(29,908)
Forfeited or expired	0
Ending Balance	233,247	263,155	727,559
Exercisable	233,247
Vested and expected to vest	233,247
Weighted Average Exercise Price
Beginning Balance	$ 9.22
Granted	0
Exercised	6.22
Forfeited or expired	0
Ending Balance	9.60	$ 9.22
Exercisable	9.60
Vested and expected to vest	$ 9.60
Weighted Average Remaining Contractual Term
Outstanding	3 years 2 months 12 days
Exercisable	3 years 2 months 12 days
Vested and Expected to Vest	3 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding	$ 8,425
Exercisable	8,425
Vested and Expected to vest	$ 8,425

Stockholders' Deficit - Additio

Stockholders' Deficit - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2016
Schedule Of Stockholders Equity [Line Items]
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, authorized shares reserved for future issuance	4,264,670
Common stock, shares authorized	50,000,000	50,000,000
Employee Stock Purchase Plan
Schedule Of Stockholders Equity [Line Items]
Common stock shares reserved for purchase			125,374
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

Common Stock for Future Issuanc

Common Stock for Future Issuance (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class Of Stock [Line Items]
Outstanding stock options	233,247	263,155	727,559
Restricted stock units	2,174,250	1,937,014	1,467,811
Total common shares reserved for future issuance	4,264,670
Stock Award Plans
Class Of Stock [Line Items]
Common stock available for future issuance	1,731,799
ESPP
Class Of Stock [Line Items]
Common stock available for future issuance	125,374

Summary of Disaggregation of Re

Summary of Disaggregation of Revenue by Service Line with Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation Of Revenue [Line Items]
Revenue	$ 74,771	$ 61,006	$ 60,581	$ 62,363	$ 67,879	$ 56,251	$ 55,089	$ 57,623	$ 258,721	$ 236,842	$ 236,523
Employer
Disaggregation Of Revenue [Line Items]
Revenue									169,800	153,481	149,776
Carrier
Disaggregation Of Revenue [Line Items]
Revenue									88,921	83,361	86,747
Software Services
Disaggregation Of Revenue [Line Items]
Revenue									202,348	184,891	186,158
Software Services | Employer
Disaggregation Of Revenue [Line Items]
Revenue									129,643	117,236	117,342
Software Services | Carrier
Disaggregation Of Revenue [Line Items]
Revenue									72,705	67,655	68,816
Professional Services
Disaggregation Of Revenue [Line Items]
Revenue									56,373	51,951	50,365
Professional Services | Employer
Disaggregation Of Revenue [Line Items]
Revenue									40,157	36,245	32,434
Professional Services | Carrier
Disaggregation Of Revenue [Line Items]
Revenue									$ 16,216	$ 15,706	$ 17,931

Summary of Contract Assets and

Summary of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue From Contract With Customer [Abstract]
Contract assets	$ 12,798	$ 11,522	$ 15,929
Contract liabilities:
Deferred revenue	$ 45,863	$ 55,027	$ 56,949

Revenue - Additional Informatio

Revenue - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Asset impairment charges related to contract assets	$ 0	$ 0
Revenue recognized included in deferred revenue beginning balance	33,421,000	25,238,000
Aggregate amount of unsatisfied or partially unsatisfied performance obligations	216,000,000
Software Services
Disaggregation Of Revenue [Line Items]
Transaction price adjustments revenue from performance obligations satisfied or partially satisfied	$ 1,161,000	$ 0

Summary of Significant Changes

Summary of Significant Changes in Contract Asset Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue From Contract With Customer [Abstract]
Transferred to receivables from contract assets	$ 20,560	$ 19,512
Revenue recognized from performance obligations satisfied but not billed	$ 21,836	$ 15,106

Revenue - Additional Informat_2

Revenue - Additional Information (Detail1)	Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-12-31
Disaggregation Of Revenue [Line Items]
Performance obligations expected satisfaction period	3 years

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	1 year	1 year
Employers matching contribution	$ 3,162	$ 3,020	$ 2,649
Maximum
Defined Contribution Plan Disclosure [Line Items]
Employers matching contribution percent of qualifying compensation	3.00%	3.00%	3.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Income Taxes [Line Items]
U.S. federal income tax examination year	2014 2015 2016 2017
Deferred tax valuation allowance	$ 82,308,000	$ 89,093,000
(Decrease) increase in valuation allowance	$ (6,785,000)	$ 7,832,000
U.S. corporate income tax rate	21.00%	34.00%	34.00%
Gross unrecognized tax benefits	$ 437,000	$ 437,000	$ 437,000	$ 437,000
Liabilities For Unrecognized Tax Benefit	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	10,483,000	10,322,000
Corporate Headquarters
Schedule Of Income Taxes [Line Items]
Tax credit carryovers	$ 10,483,000	10,322,000
Expiration of tax credit carryforward, beginning year	2,020
Expiration of tax credit carryforward, ending year	2,033
Federal
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	$ 287,686,000	253,946,000
State and Local Jurisdiction
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards	$ 285,377,000	$ 221,189,000
Federal and State
Schedule Of Income Taxes [Line Items]
Net operating loss carryforwards expiration, beginning year	2,019
Net operating loss carryforwards expiration, ending year	2,037
Unrecognized Tax Benefit
Schedule Of Income Taxes [Line Items]
Gross unrecognized tax benefits	$ 437,000

Summary of Components of Income

Summary of Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 0	$ 0	$ 0
State and local	28	15	17
Total current expense	28	15	17
Deferred:
Federal	0	0	0
State and local	0	0	0
Total deferred taxes	$ 0	$ 0	$ 0

Reconciliation Between Effect o

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	34.00%	34.00%
State income taxes, net of federal benefit	10.30%	6.60%	6.00%
Change in state tax rates	1.70%	0.40%	2.60%
Change in federal tax rates	0.00%	(67.80%)	0.00%
Change in valuation allowance	(29.40%)	24.30%	(46.30%)
State tax credits	0.30%	0.40%	4.00%
Stock-based compensation	(2.20%)	3.80%	(0.10%)
Section 162(m)	(0.80%)	(1.20%)	0.00%
Other permanent items	(0.90%)	(0.50%)	(0.20%)
Deferred true-up	0.00%	0.00%	0.00%
Income tax provision effective rate	0.00%	0.00%	0.00%

Components of Deferred Tax Asse

Components of Deferred Tax Asset and Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets relating to:
Net operating loss carryforwards	$ 82,057	$ 69,452
Deferred revenue	3,150	7,929
Commissions and incentive accrual	678	547
Deferred rent	433	471
State tax credits	7,936	7,866
Stock-based compensation	4,595	4,060
Compensation and other accruals	0	2,539
Property and equipment and intangible assets	1,138	551
Interest limitation	968	0
Total gross deferred tax assets	100,955	93,415
Deferred tax liabilities
Compensation and other accruals	(2,366)	(4,322)
Convertible debt	(16,281)	0
Total gross deferred tax liabilities	(18,647)	(4,322)
Deferred tax assets less liabilities	82,308	89,093
Less: valuation allowance	(82,308)	(89,093)
Net deferred tax asset (liability)	$ 0	$ 0

Reconciliation of Unrecognized

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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 Infor_3

Segments and Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenue from external customers									$ 258,721	$ 236,842	$ 236,523
Depreciation and amortization									15,815	15,906	13,073
Gross profit	$ 39,358	$ 29,266	$ 29,860	$ 30,960	$ 33,705	$ 24,941	$ 25,393	$ 25,421	129,444	109,460	113,215
Employer
Segment Reporting Information [Line Items]
Net revenue from external customers									169,800	153,481	149,776
Depreciation and amortization									10,232	10,229	8,116
Gross profit									75,397	58,347	61,951
Carrier
Segment Reporting Information [Line Items]
Net revenue from external customers									88,921	83,361	86,747
Depreciation and amortization									5,583	5,677	4,957
Gross profit									$ 54,047	$ 51,113	$ 51,264

Related Parties - Additional In

Related Parties - Additional Information (Detail)	Dec. 31, 2016	Dec. 12, 2016ft²Lease_AgreementsOptionPerson$ / ft²	Feb. 24, 2015shares	Aug. 24, 2017USD ($)	Dec. 31, 2018USD ($)ft²Lease_Agreements	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Related Party Transaction [Line Items]
Lease renewal option term	15 years						15 years
Lease operating expenses					$ 10,659,000	$ 10,328,000	$ 10,417,000
Due to related party, current					833,000	901,000
Stockholders and Executives
Related Party Transaction [Line Items]
Due to related party, current					0	0
Service from related party					107,000	$ 20,000	80,000
Company Director
Related Party Transaction [Line Items]
Due to related party, current					35,000
Service from related party					35,000
Aggregate amount of payments					$ 115,000
Mercer LLC
Related Party Transaction [Line Items]
Stock issued, shares | shares			2,817,526
Maximum number of shares to be issued under warrant agreement | shares			580,813
Percentage of beneficial ownership of common stock					8.80%
Revenue from related parties				$ 17,611,000			$ 27,663,000
Mercer LLC | Minimum
Related Party Transaction [Line Items]
Percentage of ownership interest sold by parent					10.00%
Mercer LLC | Maximum
Related Party Transaction [Line Items]
Percentage of beneficial ownership of common stock				10.00%
Goldman Sachs Group, Inc.
Related Party Transaction [Line Items]
Outstanding common stock ownership percentage					11.80%
Goldman Sachs Group, Inc. | Revolving Line of Credit
Related Party Transaction [Line Items]
Revolving commitment amount from related party					$ 10,000,000
Percentage of loan amounts borrowed under credit facility					10.50%
Related Party Leasing Arrangements | Non-Cancellable Leases
Related Party Transaction [Line Items]
Number of Lease agreements | Lease_Agreements		3			3
Lease renewal option term					5 years
Percentage of fixed annual rent increases					3.00%
Area of building (in square foot) | ft²					145,800
Lease commencement date					Jan. 1, 2015
Extended leases, expiration date					Dec. 31, 2031
Waived accrued and future carrying costs and termination fees payable					$ 1,223,000
Reduced percentage of annual rent increase contingent upon construction of building					2.00%
Related Party Leasing Arrangements | Cancelable Lease Agreement
Related Party Transaction [Line Items]
Lease renewal option term		1 year
Percentage of fixed annual rent increases		2.00%
Area of building (in square foot) | ft²		145,800
Lease commencement date		Jul. 1, 2020
Number of stockholders and executives affiliated to leasing entity | Person		1
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
Option To Extend Lease Term	15 years				15 years

Unaudited Quarterly Statements

Unaudited Quarterly Statements of Operations Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 74,771		$ 61,006		$ 60,581		$ 62,363		$ 67,879		$ 56,251		$ 55,089		$ 57,623		$ 258,721	$ 236,842	$ 236,523
Gross profit	39,358		29,266		29,860		30,960		33,705		24,941		25,393		25,421		129,444	109,460	113,215
Total operating expenses	48,995		37,600		40,915		41,633		37,338		35,888		36,213		37,961		169,143	147,400	145,671
Operating loss	(9,637)		(8,334)		(11,055)		(10,673)		(3,633)		(10,947)		(10,820)		(12,540)		(39,699)	(37,940)	(32,456)
Net loss	$ (12,966)		$ (11,598)		$ (14,261)		$ (13,802)		$ (6,855)		$ (14,006)		$ (13,850)		$ (15,583)		$ (52,627)	$ (50,294)	$ (40,346)
Net loss per common share, basic and diluted	$ (0.41)	[1]	$ (0.36)	[1]	$ (0.45)	[1]	$ (0.44)	[1]	$ (0.22)	[1]	$ (0.45)	[1]	$ (0.45)	[1]	$ (0.51)	[1]	$ (1.66)	$ (1.62)	$ (1.36)
Weighted-average common shares outstanding--basic and diluted	31,988,033		31,883,029		31,806,972		31,333,348		31,285,263		31,181,141		31,076,995		30,658,468		31,756,415	31,052,378	29,589,857
[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

Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	Feb. 25, 2019	Jan. 31, 2019	Feb. 26, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Number of restricted stock units, granted				1,664,652
Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Vesting period of restricted stock awards				4 years
Subsequent Event
Subsequent Event [Line Items]
Issuance of common stock upon exercises of stock option and vesting of restricted stock units			23,121
Subsequent Event | Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Number of restricted stock units, granted		35,284
Restricted stock units, aggregate grant date fair value		$ 1,710
Subsequent Event | Restricted Stock Units (RSUs) | Minimum
Subsequent Event [Line Items]
Vesting period of restricted stock awards		3 years
Subsequent Event | Restricted Stock Units (RSUs) | Maximum
Subsequent Event [Line Items]
Vesting period of restricted stock awards		4 years
Subsequent Event | Connecture, Inc
Subsequent Event [Line Items]
Purchase price	$ 24,000

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Allowance For CreditLoss
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 3,531		$ 4,595		$ 2,585
Additions Charged To Expense		138		75		667
Additions Charged Against Revenue		4,813		5,593		5,004
Deductions		(4,898)		(6,732)		(3,661)
Balance at End of Period		3,584		3,531		4,595
Deferred tax asset valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		89,093	[1],[2],[3]	81,261	[2],[3],[4]	63,252	[4]
Additions Charged To Costs and Expenses	[5]	15,444	[1]	41,904	[2],[3]	18,009	[4]
Deductions		(22,229)	[1]	(34,072)	[2],[3]	0	[4]
Balance at End of Period		$ 82,308	[1]	$ 89,093	[1],[2],[3]	$ 81,261	[2],[3],[4]
[1]	Decrease in valuation on allowances is related to adjustments to deferred revenue and convertible debt issuance.
[2]	Decrease in valuation on allowances is related to the change in the enacted tax rule.
[3]	Increase in valuation allowance is related to adoption of ASU 2016-09.
[4]	Beginning balance has been adjusted for the effects of adoption of Topic 606.
[5]	Increase in valuation allowance is related to the generation of net operating losses and other deferred tax assets.