Castlight Health (CSLT) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 07, 2018
Class of Stock [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	CSLT
Entity Registrant Name	CASTLIGHT HEALTH, INC.
Entity Central Index Key	1,433,714
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Class A
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		51,923,213
Class B
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		84,139,213

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 48,174	$ 61,319
Marketable securities	26,433	32,025
Accounts receivable and other, net	33,129
Prepaid expenses and other current assets	3,632	3,991
Total current assets	111,368	119,268
Property and equipment, net	4,791	5,263
Restricted cash, non-current	1,325	1,325
Goodwill	91,785	91,785
Intangible assets, net	19,111	20,253
Deferred commissions and professional services costs	25,830
Deferred Professional Service Costs	12,318	12,480
Other assets	2,150	1,997
Total assets	268,678	279,883
Current liabilities:
Accounts payable	5,549	3,907
Accrued expenses and other current liabilities	12,473	13,178
Accrued compensation	7,551	13,941
Deferred revenue	30,050
Total current liabilities	55,623	57,011
Deferred revenue, non-current	3,575
Debt, non-current	4,648	4,958
Other liabilities, non-current	2,594	1,900
Total liabilities	66,440	68,326
Commitments and contingencies
Stockholders’ equity (deficit):
Additional paid-in capital	592,023	586,900
Accumulated other comprehensive income	(20)	(22)
Accumulated deficit	(389,778)
Total stockholders’ equity (deficit)	202,238	211,557
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	268,678	279,883
Class A
Stockholders’ equity (deficit):
Common stock value issued	$ 13	$ 13

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017
Revenue:
Subscription		$ 32,989
Professional services and other		3,490
Total revenue, net		36,479		$ 27,703
Cost of revenue:
Cost of subscription		9,174	[1]	4,246
Cost of professional services	[1]	5,769
Total cost of revenue		14,943		8,055
Gross profit		21,536		19,648
Operating expenses:
Sales and marketing	[1]	13,912		14,145
Research and development	[1]	15,371		11,071
General and administrative	[1]	6,825		8,998
Total operating expenses		36,108		34,214
Operating loss		(14,572)		(14,566)
Other income, net		128		192
Net loss		$ (14,444)		$ (14,374)
Net loss per share, basic and diluted		$ (0.11)		$ (0.14)
Weighted-average shares used to compute basic and diluted net loss per share		134,994		104,935
[1]	Includes stock-based compensation expense as follows: Cost of subscription $120 and $67. Cost of professional services $535 and $450. Sales and marketing $2,219 and $2,074. Research and development $1,264 and $730. General and administrative $971 and $896.

Consolidated Statements of Ope4

Consolidated Statements of Operations Parenthetical - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cost of subscription [Member]
Allocated Share-based Compensation Expense	$ 242	$ 127
Cost of professional services [Member]
Allocated Share-based Compensation Expense	301	246
Sales and marketing [Member]
Allocated Share-based Compensation Expense	1,138	2,154
Research and development [Member]
Allocated Share-based Compensation Expense	1,654	1,790
General and administrative [Member]
Allocated Share-based Compensation Expense	$ 1,257	$ 1,295

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (14,444)	$ (14,374)
Other comprehensive income (loss):
Net change in unrealized gain (loss) on available-for-sale marketable securities	2	(19)
Other comprehensive income (loss)	2	(19)
Comprehensive loss	$ (14,442)	$ (14,393)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Restricted cash, non-current	$ 1,325	$ 1,144
Operating activities:
Net loss	(14,444)	(14,374)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,860	698
Stock-based compensation	4,592
Amortization of deferred commissions	2,853
Release of deferred tax valuation allowance due to business combination		(64)
Accretion and amortization of marketable securities	131
Changes in operating assets and liabilities:
Accounts receivable and others, net	11,196	1,691
Deferred commissions	(1,171)
Prepaid expenses and other assets	(206)	1,183
Accounts payable	1,783	177
Accrued expenses and other liabilities	(7,627)	(4,755)
Deferred revenue	3,183
Net cash used in operating activities	(18,972)	(10,912)
Investing activities:
Purchase of property and equipment	388	166
Purchase of marketable securities	10,025	16,007
Maturities of marketable securities	15,750	34,799
Net cash provided by investing activities	5,337	18,626
Financing activities:
Proceeds from the exercise of stock options	490	374
Payments of issuance costs related to equity	0	612
Net cash provided by (used in) financing activities	490	(238)
Cash, cash equivalents and restricted cash at beginning of period	61,319
Cash, cash equivalents and restricted cash at end of period	48,174	56,198
Non-cash investing and financing activity:
Cash, cash equivalents and restricted cash at beginning of period	$ 49,499	$ 57,342

Organization and Description of

Organization and Description of Business	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Castlight Health, Inc. (“Castlight” or “the Company”) offers a comprehensive software-as-a-service platform that simplifies health benefits navigation for millions of employees. The Castlight platform matches employees to the best resources their employers make available to them - whether they are healthy, actively seeking medical care, or managing a condition - and motivates them to take the best steps for their health. Castlight helps employers generate more value from their benefits investments by helping to improve outcomes, lower health care costs, and increase benefits satisfaction. On April 3, 2017, the Company expanded into wellbeing through its acquisition of Jiff, Inc. (“Jiff”). Jiff's results of operations have been included in the Company’s Consolidated Statements of Operations beginning April 3, 2017. See Note 5– Business Combinations for more information on the Jiff acquisition. The Company was incorporated in the State of Delaware in January 2008. The Company's principal executive offices are located in San Francisco, California.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Accounting Standards and Significant Accounting Policies Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements include Castlight and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. In the opinion of management, the information herein reflects all adjustments, consisting only of normal recurring adjustments except as otherwise noted, considered necessary for a fair statement of results of operations, financial position and cash flows. The results for the interim periods presented are not necessarily indicative of the results expected for any future period. The following information should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . Effective January 1, 2018, the Company adopted Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (“ASC 606”) . All amounts and disclosures set forth in this Form 10-Q have been updated to comply with this update, as indicated by the “as adjusted” label. Certain prior period amounts reported in the condensed consolidated financial statements and notes have been reclassified to conform to current period presentation. Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires the Company to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period. These estimates include, but are not limited to the determination of: • The fair value of assets acquired and liabilities assumed for business combination; • The amortization period for deferred commissions and deferred professional services costs; • Variable consideration included in the transaction price of the Company’s contracts with customers; • The standalone selling price of the performance obligations in the Company’s contracts with customers; and • Assumptions used in the valuation of certain equity awards. Actual results could differ from those estimates, and such differences could be material to the Company’s consolidated financial position and results of operations. Recently Adopted Accounting Pronouncements In May 2014 the Financial Accounting Standards Board (“FASB”) issued ASC 606. ASC 606 supersedes the revenue recognition requirements in ASC 605, Revenue Recognition , and requires the recognition of revenue when promised goods or services are transferred to customers in an amount that reflects the considerations to which the entity expects to be entitled to in exchange for those goods or services. ASC 606 also includes Subtopic 340-40, Other Assets and Deferred Costs - Contracts with Customers , which requires the deferral of incremental costs of obtaining and fulfilling a contract with a customer. The key changes from adopting the new standard are: • Prior to the adoption of the new standard, the Company recognized revenue of the combined professional services and subscription deliverable over the contractual term of the subscription contract. For certain contracts, this included periods that were cancelable due to termination provisions. Under the new standard, the Company recognizes revenue for the combined professional services and subscription performance obligation over the non-cancelable term of the arrangement. Additionally, prior to the adoption of the new standard, revenue related to variable fees was deferred until the fees became fixed or determinable. Under the new standard, the Company estimates variable consideration at the most likely amount to which the Company expects to be entitled. The Company includes estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. • Prior to the adoption of the new standard, the Company capitalized incremental and direct costs to obtain subscription contracts and amortized those costs over the non-cancelable portion of contracts. Under the new standard, the Company capitalizes all incremental costs to obtain subscription contracts and then amortizes those costs on a systematic basis that is consistent with the transfer to the customer of the goods or services to which those assets relate, which the Company has determined to be five years for initial subscription contracts or the contractual period for renewal subscription contracts. • Prior to the adoption of the new standard, the Company expensed costs to fulfill subscription contracts when they were incurred. Under the new standard, the Company recognizes as assets certain costs incurred to fulfill subscription contracts. Additionally, under the new standard, these costs are amortized on a systematic basis over a period that is consistent with the transfer to the customer of the goods or services to which those assets relate, which the Company has determined to be five years. Select unaudited condensed consolidated balance sheet line items, which reflect the adoption of ASC 606 are as follows (in thousands): As of December 31, 2017 Previously Reported Adjustments As adjusted Assets Accounts receivable and other, net $ 20,761 $ 1,172 $ 21,933 Deferred commissions* 10,583 16,929 27,512 Deferred professional service costs — 12,480 12,480 Liabilities and stockholders' equity Deferred revenue 29,410 (3,425 ) 25,985 Deferred revenue, non-current 6,686 (2,229 ) 4,457 Accumulated deficit (411,569 ) 36,235 (375,334 ) _______________________ * As of December 31, 2017, Deferred commissions, current and non-current, were previously presented separately. The condensed consolidated balance sheet as of December 31, 2017 was reclassified to conform to the current period presentation. Select unaudited condensed consolidated statement of operations line items, which reflect the adoption of ASC 606 are as follows (in thousands, except per share amounts): Three Months Ended March 31, 2017 Previously Reported Adjustments As adjusted Revenue: Subscription $ 25,766 $ 131 $ 25,897 Professional services and other 1,979 (173 ) 1,806 Cost of revenue: Cost of professional services and other 3,988 (179 ) 3,809 Operating expenses: Sales and marketing 14,443 (298 ) 14,145 Operating loss (15,001 ) 435 (14,566 ) Net loss (14,809 ) 435 (14,374 ) Net loss per share, basic and diluted (0.14 ) — (0.14 ) Select unaudited condensed consolidated statement of cash flows line items, which reflect the adoption of ASC 606 are as follows (in thousands): Three Months Ended March 31, 2017 Previously Reported Adjustments As adjusted Operating activities: Net loss $ (14,809 ) $ 435 $ (14,374 ) Adjustments to reconcile net loss to net cash used in operating activities: Stock-based compensation 5,827 (215 ) 5,612 Amortization of deferred professional costs — 887 887 Amortization of deferred commissions 2,089 (156 ) 1,933 Changes in operating assets and liabilities: Deferred commissions (416 ) (141 ) (557 ) Deferred professional service costs — (852 ) (852 ) Deferred revenue 3,087 42 3,129 Summary of Significant Accounting Policies Revenue Recognition Revenues are derived primarily from contracts with customers for subscription services and professional services. Revenues are recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services. Revenues do not include sales taxes. We determine revenue recognition through the following steps: • Identification of the contract, or contracts, 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, the Company satisfies a performance obligation. Subscription Revenue. Subscription revenue recognition commences on the date that the Company’s subscription services are made available to the customer, which the Company considers to be the launch date, and subscription revenue is generally recognized over the contract term. Subscription contracts are generally three years in length and certain contracts include termination provisions. Some of the Company’s subscription contracts include performance incentives that are generally based on engagement. Additionally, some of the Company’s subscription contracts include audit provisions. The Company considers fees related to performance incentives and audit provisions to be variable consideration. The Company estimates variable consideration at the most likely amount to which it expects to be entitled. The Company includes estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved. The Company’s estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of its anticipated performance as well as other information available to the Company. The Company reassesses its estimates related to variable consideration each reporting period and records adjustments when appropriate. Professional Services and Other Revenue. Professional services and other revenue is primarily comprised of implementation services and communication services related to the Company's subscription service. Nearly all of the Company's professional services are sold on a fixed-fee basis. The Company determined its implementation services are not capable of being distinct. Accordingly, the Company recognizes implementation services revenue in the same manner as the subscription service, beginning on the launch date. The Company determined its communication services are distinct and the associated revenue is recognized over time from the commencement of the communication services through the end of the contractual term. Professional services and other revenue also includes revenue from products sold through the Company’s online marketplace and add-on subscription services made available from other ecosystem partners. These revenues are recognized on a net basis primarily because the Company acts as an agent in these contracts. Contracts with Multiple Performance Obligations. Most of the Company’s contracts have multiple performance obligations consisting of subscription services and professional services, including implementation services and communication services. For arrangements with multiple performance obligations, the Company evaluates whether the individual performance obligations are distinct. If the performance obligations are distinct, revenue is recognized for the respective performance obligation separately. If one or more of the performance obligations are not distinct, the performance obligations that are not distinct are combined with the Company's subscription service, and revenue for the combined performance obligation is recognized over the term of the subscription service commencing on the launch date. The Company has concluded that its subscription services and its communication services are distinct. Conversely, the Company has concluded that its implementation services are not distinct, primarily because these services are not capable of being distinct as the customer cannot benefit from the implementation services on their own. Accordingly, the Company considers the separate performance obligations in its multiple performance obligation contracts to be communication services and a combined performance obligation comprised of subscription services and implementation services. The transaction price for arrangements with multiple performance obligations is allocated to the separate performance obligations based on their standalone selling price. The Company determines standalone selling prices based on its overall pricing objectives taking into consideration market conditions and other factors, including the value of the contracts, the subscription services sold, and customer demographics. Contract Balances The Company records a contract asset when revenue is recognized prior to invoicing. Contract assets are presented within accounts receivable and other in the accompanying condensed consolidated balance sheet. A contract liability represents deferred revenue. Deferred revenue consists of professional services and cloud-based subscription services that have been billed in advance of revenue being recognized. The Company invoices its customers for its cloud-based subscription services based on the terms of the contract, which can be annual, quarterly or monthly installments. Deferred revenue that is anticipated to be recognized during the succeeding 12-month period is recorded as current deferred revenue, and the remaining portion is recorded as non-current. Accounts Receivable and Other Accounts receivable are recorded when invoiced and at the invoiced amount, net of allowances for doubtful accounts, which are not significant for any period presented. When accounts receivable are recorded, the related revenue may not commence until a later date depending on the nature of the services invoiced. Deferred Commissions Deferred commissions are the incremental costs that are incurred to obtain contracts with customers and consist primarily of sales commissions paid to the Company's sales force and channel partners. The commissions for initial contracts are deferred and amortized on a straight-line basis over a period of benefit that the Company has determined typically to be five years. The Company determined the period of benefit by taking into consideration the expected life of its subscription contracts, the expected life of the technology underlying its subscription services and other factors. The commissions for renewal contracts are deferred and then amortized on a straight-line basis over the related contractual renewal period. The deferred commission amounts are recoverable through the Company’s future revenues. Amortization of deferred commissions is included in sales and marketing expense in the accompanying condensed consolidated statements of operations. All costs deferred are reviewed for impairment periodically. Deferred Professional Service Costs Deferred professional services costs are the direct costs incurred to fulfill subscription contracts that occur prior to the launch of the Company’s subscription services. Professional service costs, which primarily consist of employee related expenses attributable to launch activities, are deferred and then amortized on a straight-line basis over a period of benefit that the Company has determined typically to be five years for the same reasons as described in the deferred commissions disclosure above. Deferred professional service costs are recoverable through future revenues. Amortization of deferred professional service costs is included in cost of professional services and other revenue in the accompanying condensed consolidated statements of operations. All costs deferred are reviewed for impairment periodically. Recently Issued Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-02, Leases (“ASU 2016-02”). The guidance will require lessees to put all leases on their balance sheets, whether operating or financing, while continuing to recognize the expenses on their income statements in a manner similar to current practice. The guidance states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The guidance will be effective for the Company beginning January 1, 2019 and early adoption is permitted. The Company is evaluating the full effect the adoption will have on its financial condition, results of operations, and disclosures. The Company is evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the impact of adoption on its consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (ASU 2018-02). The provisions in ASU 2018-02 allow for a reclassification from accumulated other comprehensive income to retained earnings to eliminate the stranded tax effects resulting from the change in federal corporate income tax rate in the Tax Cuts and Jobs Act enacted in December 2017. The Company is required to adopt ASU 2018-02 on January 1, 2019. Early adoption is permitted, including adoption in any interim period for which financial statements have not yet been issued. The adoption of ASU 2018-02 is not expected to have a significant impact on the Company’s financial position or results of operations.

Contract Balances and Performan

Contract Balances and Performance Obligations (Notes)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Contract Balances and Performance Obligations The Company sells to customers based in the United States. Deferred revenue as of March 31, 2018 and December 31, 2017 was $33.6 million and $30.4 million , respectively. Contract assets as of March 31, 2018 and December 31, 2017 were $1.7 million and $1.2 million , respectively. $15.9 million and $12.1 million of revenue was recognized during the three months ended March 31, 2018 and 2017, respectively, that was included in the deferred revenue balances at the beginning of the respective periods. Cumulative catch-up adjustments arising from changes in estimates of transaction price were immaterial during the three months ended March 31, 2018 and 2017. The aggregate balance of remaining performance obligations from non-cancelable contracts with customers as of March 31, 2018 was $174.0 million . The Company expects to recognize approximately 70% of this balance over the next 12 months, with the remaining balance recognized thereafter. Remaining performance obligations are defined as deferred revenue and amounts yet to billed for the non-cancelable portion of our contracts.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company measures its financial assets and liabilities at fair value at each reporting period using a fair value hierarchy that requires that the Company maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value: Level 1—Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets. Level 2—Include other inputs that are directly or indirectly observable in the marketplace. Level 3—Unobservable inputs that are supported by little or no market activity. The fair value of marketable securities included in the Level 2 category is based on observable inputs, such as quoted prices for similar assets at the measurement date; quoted prices in markets that are not active; or other inputs that are observable, either directly or indirectly. These values were obtained from a third-party pricing service and were evaluated using pricing models that vary by asset class and may incorporate available trade, bid and other market information and price quotes from well-established third party pricing vendors and broker-dealers. There have been no changes in valuation techniques in the periods presented. There were no significant transfers between fair value measurement levels as of March 31, 2018 and December 31, 2017 . 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 input categories (in thousands): Level 1 Level 2 Total March 31, 2018 Cash equivalents: Money market mutual funds $ 8,159 $ — $ 8,159 U.S. agency obligations — 16,562 16,562 U.S. treasury securities — 1,500 1,500 Marketable securities: U.S. agency obligations — 852 852 U.S. treasury securities — 25,580 25,580 $ 8,159 $ 44,494 $ 52,653 Level 1 Level 2 Total December 31, 2017 Cash equivalents: Money market mutual funds $ 6,115 $ — $ 6,115 U.S. agency obligations — 18,366 18,366 Marketable securities: U.S. agency obligations — 1,000 1,000 U.S. treasury securities — 31,025 31,025 $ 6,115 $ 50,391 $ 56,506 Gross unrealized gains and losses for cash equivalents and marketable securities as of March 31, 2018 and December 31, 2017 were not material. The Company does not believe the unrealized losses represent other-than-temporary impairments based on the Company’s evaluation of available evidence as of March 31, 2018 and December 31, 2017 . There were no realized gains or losses during the three months ended March 31, 2018 . All of the Company’s marketable securities at March 31, 2018 and December 31, 2017 mature within one year . Marketable securities on the balance sheets consist of securities with original or remaining maturities at the time of purchase of greater than three months, and the remainder of the securities is reflected in cash and cash equivalents.

Marketable Securities

Marketable Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities All of the Company’s cash equivalents and marketable securities are classified as “available-for-sale” securities. These securities are reported at fair value, with the related unrealized gains and losses included in accumulated other comprehensive income, a component of stockholders’ equity. As of March 31, 2018 and December 31, 2017 , respectively, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Fair Value March 31, 2018 U.S. agency obligations $ 17,413 $ 1 $ — $ 17,414 U.S. treasury securities 27,101 — (21 ) 27,080 Money market mutual funds 8,159 — — 8,159 52,673 1 (21 ) 52,653 Included in cash and cash equivalents 26,219 1 — 26,220 Included in marketable securities $ 26,454 $ 1 $ (21 ) $ 26,433 Amortized Cost Unrealized Gains Unrealized Losses Fair Value December 31, 2017 U.S. agency obligations $ 19,366 $ — $ — $ 19,366 U.S. treasury securities 31,047 — (22 ) 31,025 Money market mutual funds 6,115 — — 6,115 56,528 — (22 ) 56,506 Included in cash and cash equivalents 24,481 — — 24,481 Included in marketable securities $ 32,047 $ — $ (22 ) $ 32,025

Business Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Business Combinations	Business Combinations On April 3, 2017, the Company completed its acquisition of Jiff, Inc. Prior to its acquisition, Jiff provided an enterprise health benefits platform that served as a central hub for employee wellbeing and employee benefit programs. The acquisition enabled the Company to offer a wellbeing platform, healthcare decision support and a benefits hub in one comprehensive package. The Company acquired Jiff for approximately 27,000,000 in shares and options. At the closing of the transaction on April 3, 2017, Venrock, a holder of more than 5% of the Company’s capital stock, acquired a total of 3,965,979 shares of the Company’s Class B common stock in exchange for its shares of Jiff capital stock. Bryan Roberts, who is the chairman of the Company’s board of directors is also a partner at Venrock. Accordingly, the business combination was considered a related party transaction. The Company’s board appointed a special committee, comprised solely of disinterested directors, to which it delegated the full and exclusive power, authority and discretion to evaluate, assess, and approve the Jiff transaction on its behalf, including retaining a financial advisor for an opinion on the fairness of the financial conditions of the transaction. The transaction was approved solely by the special committee, which concluded that the transaction terms were fair to the Company and that the transaction was in the best interests of the Company and its stockholders. As part of the merger, all options to purchase Jiff common stock held by Jiff employees who became employees of the combined company were converted into options to purchase the Company’s Class B common stock. Additionally, certain stockholders and option holders were to receive an aggregate of 1,000,000 shares of the Company’s Class B common stock or options to purchase the Company’s Class B common stock if the Jiff business achieved at least $25 million in revenue in 2017, and an aggregate of 3,000,000 shares of Class B common stock or options to purchase the Company’s Class B common stock if the Jiff business achieved at least $25 million in net new bookings during 2017 (“the milestones”). As of December 31, 2017, the Company evaluated and determined that both milestones were not met. The following table summarizes the components of the purchase consideration transferred based on the closing price of the Company’s stock as of the acquisition date (in thousands): Fair value Fair value of Company Class B common stock (25,054,049 shares $3.65 per share) $ 91,447 Fair value of contingent consideration 671 Fair value of assumed Jiff options attributable to pre-combination services 9,574 Transaction costs paid on behalf of Jiff 4,498 Estimated purchase price consideration $ 106,190 For the Jiff options assumed as part of the acquisition, the Company applied the ratio of pre-combination service provided, on a grant-by-grant basis, to the total service period and applied this ratio to the acquisition date fair value of the Jiff awards. The Company determined that the contingent consideration shares associated with the milestones are one unit of account, and classified the contingent consideration as a liability as the arrangement can be settled in a variable number of shares and is not considered fixed-for-fixed. The Company determined that the fair value of the contingent consideration liability was $0.7 million at the date of the acquisition. The fair value was estimated by applying the Monte Carlo simulation model, based on the probability of completing the milestones and the changes in the fair value of the Company’s common stock. As of December 31, 2017, the Company reversed the contingent consideration liability as the milestones were not met. The allocation of purchase consideration to assets acquired and liabilities assumed is not yet finalized. The Company continues to evaluate the fair value of certain assets and liabilities related to the acquisition of Jiff. Additional information, which existed as of the acquisition date but was at that time unknown to the Company, may become known during the remainder of the measurement period. Changes to amounts recorded as assets or liabilities may result in a corresponding adjustment to goodwill. The preliminary estimated fair values of assets acquired and liabilities assumed may be subject to change as additional information is received. The fair values of the assets acquired and liabilities assumed by major class in the acquisition of Jiff were recognized as follows (in thousands): Cash $ 2,234 Current assets 5,159 Other assets 1,971 Acquired intangible assets 23,900 Goodwill 91,785 Total assets acquired 125,049 Deferred revenue (1,857 ) Other current liabilities (6,192 ) Debt (5,578 ) Non-current liabilities (5,232 ) Total net assets acquired $ 106,190 The fair values assigned to tangible assets acquired, liabilities assumed and identifiable intangible assets are based on management’s estimates and assumptions. The excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. The goodwill balance is primarily attributed to the cross-selling opportunities, cost synergies, and a knowledgeable and experienced workforce which play an important role in the integration of the acquired customers and technology. The goodwill balance is not deductible for U.S. income tax purposes. The following table sets forth the fair value components of identifiable acquired intangible assets (in thousands) and their estimated useful lives (in years): Fair Value Useful Life Customer relationships $ 10,900 10 Developed technology 10,600 5 Backlog 1,500 3 Other acquired intangible assets 900 1-3 Total identifiable intangible assets $ 23,900 Customer relationships represent the fair value of projected cash flows that will be derived from the sale of products to Jiff's existing customers based on existing, in-process, and future versions of the underlying technology. Developed technology represents Jiff’s benefits platform. The Company used the relief from royalty method to value the developed technology. To determine the net cash flow that a market participant would expect to realize from licensing the Company's technology, the Company estimated a net royalty rate, which excludes any expenses that would be incurred to maintain the current functionality of the technology. The Company has included the financial results of Jiff in the Company’s condensed consolidated statements of operations from the date of acquisition. The unaudited pro forma financial information in the table below summarizes the combined results of operations for the Company and Jiff as if the companies were combined as of the beginning of 2016 (the beginning of the comparable prior reporting period in the year of acquisition). The unaudited pro forma condensed combined financial information is presented for informational purposes only. The historical consolidated financial statements have been adjusted in the pro forma combined financial statements to give effect to pro forma events that are directly attributable to the business combination and factually supportable. The unaudited pro forma financial information presented includes the business combination accounting effects resulting from the acquisition, including amortization charges from acquired intangible assets, stock-based compensation, and acquisition-related costs. In addition, the pro forma combined financial statements give effect to the adoption of the new standard. The following table presents the unaudited pro forma condensed combined financial information for the periods presented, except for the financial information presented for the three months ended March 31, 2018 which is presented on an as-reported basis (in thousands): Three Months Ended March 31, 2018 2017 Total revenue $ 36,479 $ 31,345 Net loss (14,444 ) (18,467 )

Property and equipment, net

Property and equipment, net	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Property and equipment	Property and Equipment Property and equipment consisted of the following (in thousands): As of March 31, 2018 December 31, 2017 Leasehold improvements $ 2,895 $ 2,915 Computer equipment 6,252 6,165 Software 1,149 1,149 Internal-use software 2,925 2,925 Furniture and equipment 1,178 1,293 Total 14,399 14,447 Accumulated depreciation (9,608 ) (9,184 ) Property and equipment, net $ 4,791 $ 5,263 Depreciation and amortization expense for the three months ended March 31, 2018 and 2017 , was $0.7 million and $0.7 million , respectively . Depreciation and amortization are recorded on a straight-line basis.

Debt (Notes)

Debt (Notes)	3 Months Ended
	Mar. 31, 2018
Debt [Abstract]
Debt	Debt Term Loan In connection with the Company’s acquisition of Jiff, on April 3, 2017, the Company, Jiff and Silicon Valley Bank (“Bank”) agreed to refinance the existing term loan facility owed by Jiff to the Bank (the “Loan Agreement”) for approximately $5.6 million (the “Term Loan”). The Term Loan requires interest-only payments for the period May 2017 through September 2018, followed by 36 monthly payments of principal and interest. Obligations under the Term Loan accrue interest at a floating per annum rate equal to the greater of (A) the prime rate as published in the money rates section of The Wall Street Journal ( “Prime Rate”) minus 1% or (B) 0% . Interest on the Term Loan is payable monthly. The maturity date of the Term Loan is September 1, 2021. In addition to principal and interest payments, the Company is also required to pay $0.5 million as final payment on the earlier of maturity, termination or prepayment of the Term Loan. The Company accrues for the final payment over the life of the Term Loan using the effective interest method. The future maturities of the Term Loan by year as of March 31, 2018 are as follows (in thousands): Remainder of 2018 $ 620 2019 1,859 2020 1,859 2021 (1) 1,240 Total future maturities of debt (2) $ 5,578 _______________________ (1) Excludes the $0.5 million required to be paid as final payment on the earlier of maturity, termination or prepayment of the Term Loan. (2) Includes $4.6 million classified as debt, non-current and $0.9 million classified as debt, current within accrued expenses and other current liabilities on the condensed consolidated balance sheet as of March 31, 2018 . Revolving Line of Credit The Loan Agreement also provides for an up to $25 million revolving credit facility (the “Revolving Line”). The Company may request borrowings under the Revolving Line prior to April 3, 2019, on which date the Revolving Line terminates. As of March 31, 2018 , no borrowings have been made under the Revolving Line. In relation to the Loan Agreement, the Company is subject to certain financial and reporting covenants. As of March 31, 2018 , none of the financial covenants, which require the Company to maintain a certain minimum liquidity ratio, are applicable. The Company was in compliance with all reporting covenants in the Loan Agreement related to the outstanding principal balance as of March 31, 2018 .

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill Currently, all of the Company’s goodwill relates to the acquisition of Jiff. The excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. There were no changes to goodwill for the three months ended March 31, 2018 . Intangible assets, net The following table sets forth the fair value components of identifiable acquired intangible assets (in thousands) and their estimated useful lives (in years) as of March 31, 2018 were as follows (in thousands): Intangible Assets, Gross Accumulated Amortization Acquired Intangibles, Net Useful Life December 31, 2017 Additions March 31, 2018 December 31, 2017 Expense March 31, 2018 March 31, 2018 Customer relationships $ 10,900 $ — $ 10,900 $ (818 ) $ (272 ) $ (1,090 ) 9,810 10 Developed technology 10,600 — 10,600 (1,590 ) (530 ) (2,120 ) 8,480 5 Backlog 1,500 — 1,500 (664 ) (148 ) (812 ) 688 3 Other acquired intangible assets 900 — 900 (575 ) (192 ) (767 ) 133 1-3 Total identifiable intangible assets $ 23,900 $ — $ 23,900 $ (3,647 ) $ (1,142 ) $ (4,789 ) $ 19,111 Amortization expense from acquired intangible assets for the three months ended March 31, 2018 was $1.1 million and is included in cost of subscription, and general and administrative and sales and marketing expenses. Estimated amortization expense for acquired intangible assets for the following five years and thereafter is as follows (in thousands): Remainder of 2018 $ 2,902 2019 3,505 2020 3,242 2021 3,210 2022 1,620 Thereafter 4,632 Total estimated amortization expense $ 19,111

Related Party Transactions (Not

Related Party Transactions (Notes)	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions and Variable Interest Entity	Note 11. Related Party Transactions and Variable Interest Entity In 2015, the Company made a preferred stock investment of $4.1 million and entered into a strategic alliance with Lyra Health, Inc. ("Lyra"), a related party at the time of the investment. During the fourth quarter of 2017, the Company sold its investment in Lyra to a group of buyers that included related parties for a total selling price of $5.5 million . Lyra was considered a related party to the Company because two of the Company’s directors, Dr. Roberts and Mr. Ebersman, serve on the Lyra board of directors and Mr. Ebersman is Lyra’s chief executive officer. Prior to the sale of the investment in Lyra, the Company determined that Lyra is a variable interest entity (“VIE”) and that it was not required to consolidate the operations of Lyra. Because Lyra was a related party and potential buyers were also related parties, the Company formed an independent committee of the Company's board of directors (the "Independent Committee"), comprised solely of disinterested directors, to approve the sale. The Company also engaged an independent third-party valuation expert to assist in determining the fair value of the Company's investment in Lyra. Based in part on the valuation performed, the Company negotiated a selling price of $5.5 million , which the Independent Committee approved after concluding that the transaction terms were fair to the Company. The sale resulted in a pre-tax gain of $1.4 million which was recorded in other income, net within the consolidated statements of operations included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 .

Stock Compensation

Stock Compensation	3 Months Ended
	Mar. 31, 2018
Equity and Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity	A summary of restricted stock unit activity for the three months ended March 31, 2018 is as follows: Number of Weighted- Balance as of December 31, 2017 9,333,896 $ 4.03 Restricted Stock Units granted (1) 3,834,618 $ 3.63 Restricted Stock Units vested (747,311 ) $ 4.38 Restricted Stock Units forfeited and canceled (2) (1,467,107 ) $ 3.59 Balance as of March 31, 2018 10,954,096 $ 3.93 _______________________ (1) Includes 0.6 million performance stock units (“PSUs”) that were granted during the three months ended March 31, 2018 . (2) Includes PSUs that were granted in the prior year, which were canceled because performance targets were not achieved.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Matters From time to time, the Company may become subject to other legal proceedings, claims or litigation arising in the ordinary course of business. In addition, the Company may receive letters alleging infringement of patents or other intellectual property rights. If an unfavorable outcome were to occur in litigation, the impact could be material to the Company’s business, financial condition, cash flow or results of operations, depending on the specific circumstances of the outcome. The Company accrues for loss contingencies when it is both probable that it will incur the loss and when it can reasonably estimate the amount of the loss or range of loss. Leases and Contractual Obligations The Company’s principal commitments primarily consist of obligations under leases for office space and co-location facilities for data center capacity. The Company’s existing lease agreements provide it with the option to renew and generally provide for rental payments on a graduated basis. The Company’s future operating lease obligations would change if it entered into additional operating lease agreements as the Company expands its operations and if it exercised these options. In March 2018, the Company subleased a portion of its office located in Mountain View, California. As a result, the total rent obligation of the Company was reduced by $2.4 million . The Company recognized a one-time charge of $0.9 million loss from sublease, as a result of total anticipated sublease income on the operating lease being less than original lease obligations which is included in research and development expense in the accompanying condensed consolidated statement of operations for the three months ended March 31, 2018. There were no other material changes in the Company’s contractual obligations from those disclosed in its Annual Report on Form 10-K for the year ended December 31, 2017. Please see Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources” in the Company’s Annual Report on Form 10-K for a description of its contractual obligations.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Stockholders’ Equity	Note 14. Stockholders’ Equity Common Stock As of March 31, 2018 , the Company had 52,432,553 shares of Class A common stock and 83,163,275 shares of Class B common stock outstanding. Transactions with SAP Technologies, Inc. In May 2016, the Company entered into a Securities Purchase Agreement (the “Securities Purchase Agreement”) with SAP Technologies, Inc. (“SAP”) pursuant to which it sold and issued to SAP 4.7 million shares of its Class B Common Stock and a warrant (the “Warrant”), which gave SAP rights to purchase up to 1.9 million shares of the Company's Class B Common Stock for an exercise price of $4.91 , subject to certain conditions. The net proceeds from this transaction were $17.8 million , net of issuance costs, and were used for working capital and other general corporate purposes. The Warrant was set to expire four years from the date the Company enters into agreements with SAP related to the distribution and the reselling of the Company’s solutions (the “Alliance Agreement”) within a prescribed period. During the second quarter of 2017, the Company and SAP modified the Warrant to extend the time period allowed to execute the Alliance Agreement from May 17, 2017 to November 17, 2017. However, the Alliance Agreement was not executed prior to that date and as a result, the Warrant expired. The shares and Warrant were considered freestanding instruments and were classified within stockholders’ equity. Initially, upon execution of the Securities Purchase Agreement, the Company preliminarily allocated the net proceeds to the shares, Warrant and a customer prepayment liability classified within accrued expenses and other current liabilities. However, as a result of the Warrant modification during the second quarter of 2017, the Company adjusted its allocation of the net proceeds, changing the classification of the customer prepayment liability to other assets. During the fourth quarter of 2017, the Company released the associated other asset and recorded a $1.1 million non-cash charge in other income, net in the consolidated statement of operations included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended March 31, 2018 and 2017 was zero percent, primarily as a result of the estimated tax loss for the year and the change in valuation allowance. As of March 31, 2018 , all unrecognized tax benefits are subject to a full valuation allowance and, if recognized, will not affect the effective tax rate. The Tax Cuts and Jobs Act enacted on December 22, 2017 resulted in substantial changes including reducing the US federal corporate income tax rate from 35 percent to 21 percent and requiring companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred. The Act creates new taxes starting in 2018 on certain foreign sourced earnings. The Company applied the guidance in SAB 118 and at December 31, 2017 recorded provisional estimates to re-measure deferred taxes and liabilities using the new 21 percent rate which resulted in a net decrease of $54.6 million , with a corresponding offsetting change in valuation allowance of $54.6 million . During the three months ended March 31, 2018, the Company has not recorded any measurement period adjustments to the provisional estimates recorded at December 31, 2017.

Net Loss per Share

Net Loss per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Loss per Share	Net Loss per Share Basic net loss per share is computed by dividing the net loss 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 Preferred Stock and outstanding stock options and warrants, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential shares of common stock outstanding would have been anti-dilutive . Net loss is allocated based on the contractual participation rights of the Class A and Class B common stock as if the earnings for the year have been distributed. As the liquidation and dividend rights are identical, the net loss is allocated on a proportionate basis . The following table presents the calculation of basic and diluted net loss per share for the Company’s common stock (in thousands, except per share data): Three Months Ended March 31, 2018 2017 (as adjusted)* Class A Class B Class A Class B Net loss $ (5,646 ) $ (8,798 ) $ (7,436 ) $ (6,938 ) Weighted-average shares used to compute basic and diluted net loss per share 52,764 82,230 54,288 50,647 Basic and diluted net loss per share $ (0.11 ) $ (0.11 ) $ (0.14 ) $ (0.14 ) _______________________ *See Note 2 for a summary of adjustments. The following securities were excluded from the calculation of diluted net loss per share for common stock because their effect would have been anti-dilutive for the periods presented (in thousands): Three Months Ended March 31, 2018 2017 Stock options and restricted stock units 20,601 16,933 Warrants 115 2,020 Total 20,716 18,953 .

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Accounting Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements include Castlight and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. In the opinion of management, the information herein reflects all adjustments, consisting only of normal recurring adjustments except as otherwise noted, considered necessary for a fair statement of results of operations, financial position and cash flows. The results for the interim periods presented are not necessarily indicative of the results expected for any future period. The following information should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 .
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires the Company to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period. These estimates include, but are not limited to the determination of: • The fair value of assets acquired and liabilities assumed for business combination; • The amortization period for deferred commissions and deferred professional services costs; • Variable consideration included in the transaction price of the Company’s contracts with customers; • The standalone selling price of the performance obligations in the Company’s contracts with customers; and • Assumptions used in the valuation of certain equity awards. Actual results could differ from those estimates, and such differences could be material to the Company’s consolidated financial position and results of operations.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued Accounting Pronouncements In February 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-02, Leases (“ASU 2016-02”). The guidance will require lessees to put all leases on their balance sheets, whether operating or financing, while continuing to recognize the expenses on their income statements in a manner similar to current practice. The guidance states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The guidance will be effective for the Company beginning January 1, 2019 and early adoption is permitted. The Company is evaluating the full effect the adoption will have on its financial condition, results of operations, and disclosures. The Company is evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the impact of adoption on its consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (ASU 2018-02). The provisions in ASU 2018-02 allow for a reclassification from accumulated other comprehensive income to retained earnings to eliminate the stranded tax effects resulting from the change in federal corporate income tax rate in the Tax Cuts and Jobs Act enacted in December 2017. The Company is required to adopt ASU 2018-02 on January 1, 2019. Early adoption is permitted, including adoption in any interim period for which financial statements have not yet been issued. The adoption of ASU 2018-02 is not expected to have a significant impact on the Company’s financial position or results of operations.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured 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 input categories (in thousands): Level 1 Level 2 Total March 31, 2018 Cash equivalents: Money market mutual funds $ 8,159 $ — $ 8,159 U.S. agency obligations — 16,562 16,562 U.S. treasury securities — 1,500 1,500 Marketable securities: U.S. agency obligations — 852 852 U.S. treasury securities — 25,580 25,580 $ 8,159 $ 44,494 $ 52,653 Level 1 Level 2 Total December 31, 2017 Cash equivalents: Money market mutual funds $ 6,115 $ — $ 6,115 U.S. agency obligations — 18,366 18,366 Marketable securities: U.S. agency obligations — 1,000 1,000 U.S. treasury securities — 31,025 31,025 $ 6,115 $ 50,391 $ 56,506
Reconciliation of Level 3 Contingent Consideration Liabilitiy

Marketable Securities (Tables)

Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	As of March 31, 2018 and December 31, 2017 , respectively, marketable securities consisted of the following (in thousands): Amortized Cost Unrealized Gains Unrealized Losses Fair Value March 31, 2018 U.S. agency obligations $ 17,413 $ 1 $ — $ 17,414 U.S. treasury securities 27,101 — (21 ) 27,080 Money market mutual funds 8,159 — — 8,159 52,673 1 (21 ) 52,653 Included in cash and cash equivalents 26,219 1 — 26,220 Included in marketable securities $ 26,454 $ 1 $ (21 ) $ 26,433 Amortized Cost Unrealized Gains Unrealized Losses Fair Value December 31, 2017 U.S. agency obligations $ 19,366 $ — $ — $ 19,366 U.S. treasury securities 31,047 — (22 ) 31,025 Money market mutual funds 6,115 — — 6,115 56,528 — (22 ) 56,506 Included in cash and cash equivalents 24,481 — — 24,481 Included in marketable securities $ 32,047 $ — $ (22 ) $ 32,025

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Summary of the Components of the Purchase Consideration Transferred	The following table summarizes the components of the purchase consideration transferred based on the closing price of the Company’s stock as of the acquisition date (in thousands): Fair value Fair value of Company Class B common stock (25,054,049 shares $3.65 per share) $ 91,447 Fair value of contingent consideration 671 Fair value of assumed Jiff options attributable to pre-combination services 9,574 Transaction costs paid on behalf of Jiff 4,498 Estimated purchase price consideration $ 106,190
Schedule of Preliminary Fair Values of Assets Acquired and Liabilities Assumed	The fair values of the assets acquired and liabilities assumed by major class in the acquisition of Jiff were recognized as follows (in thousands): Cash $ 2,234 Current assets 5,159 Other assets 1,971 Acquired intangible assets 23,900 Goodwill 91,785 Total assets acquired 125,049 Deferred revenue (1,857 ) Other current liabilities (6,192 ) Debt (5,578 ) Non-current liabilities (5,232 ) Total net assets acquired $ 106,190
Schedule of Identifiable Acquired Intangible Assets	The following table sets forth the fair value components of identifiable acquired intangible assets (in thousands) and their estimated useful lives (in years): Fair Value Useful Life Customer relationships $ 10,900 10 Developed technology 10,600 5 Backlog 1,500 3 Other acquired intangible assets 900 1-3 Total identifiable intangible assets $ 23,900
Schedule of Unaudited Pro Forma Financial Information		The following table presents the unaudited pro forma condensed combined financial information for the periods presented, except for the financial information presented for the three months ended March 31, 2018 which is presented on an as-reported basis (in thousands): Three Months Ended March 31, 2018 2017 Total revenue $ 36,479 $ 31,345 Net loss (14,444 ) (18,467 )

Property and equipment, net (Ta

Property and equipment, net (Tables)	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property and equipment consisted of the following (in thousands): As of March 31, 2018 December 31, 2017 Leasehold improvements $ 2,895 $ 2,915 Computer equipment 6,252 6,165 Software 1,149 1,149 Internal-use software 2,925 2,925 Furniture and equipment 1,178 1,293 Total 14,399 14,447 Accumulated depreciation (9,608 ) (9,184 ) Property and equipment, net $ 4,791 $ 5,263

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Debt [Abstract]
Schedule of Maturities of Long-term Debt	The future maturities of the Term Loan by year as of March 31, 2018 are as follows (in thousands): Remainder of 2018 $ 620 2019 1,859 2020 1,859 2021 (1) 1,240 Total future maturities of debt (2) $ 5,578

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill
Schedule of Finite-Lived Intangible Assets	The following table sets forth the fair value components of identifiable acquired intangible assets (in thousands) and their estimated useful lives (in years) as of March 31, 2018 were as follows (in thousands): Intangible Assets, Gross Accumulated Amortization Acquired Intangibles, Net Useful Life December 31, 2017 Additions March 31, 2018 December 31, 2017 Expense March 31, 2018 March 31, 2018 Customer relationships $ 10,900 $ — $ 10,900 $ (818 ) $ (272 ) $ (1,090 ) 9,810 10 Developed technology 10,600 — 10,600 (1,590 ) (530 ) (2,120 ) 8,480 5 Backlog 1,500 — 1,500 (664 ) (148 ) (812 ) 688 3 Other acquired intangible assets 900 — 900 (575 ) (192 ) (767 ) 133 1-3 Total identifiable intangible assets $ 23,900 $ — $ 23,900 $ (3,647 ) $ (1,142 ) $ (4,789 ) $ 19,111
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated amortization expense for acquired intangible assets for the following five years and thereafter is as follows (in thousands): Remainder of 2018 $ 2,902 2019 3,505 2020 3,242 2021 3,210 2022 1,620 Thereafter 4,632 Total estimated amortization expense $ 19,111

Stock Compensation (Tables)

Stock Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Equity and Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	2.72% - 2.74%
Schedule of Other Share-based Compensation, Activity	A summary of restricted stock unit activity for the three months ended March 31, 2018 is as follows: Number of Weighted- Balance as of December 31, 2017 9,333,896 $ 4.03 Restricted Stock Units granted (1) 3,834,618 $ 3.63 Restricted Stock Units vested (747,311 ) $ 4.38 Restricted Stock Units forfeited and canceled (2) (1,467,107 ) $ 3.59 Balance as of March 31, 2018 10,954,096 $ 3.93 _______________________ (1) Includes 0.6 million performance stock units (“PSUs”) that were granted during the three months ended March 31, 2018 . (2) Includes PSUs that were granted in the prior year, which were canceled because performance targets were not achieved.

Net Loss per Share (Tables)

Net Loss per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the calculation of basic and diluted net loss per share for the Company’s common stock (in thousands, except per share data): Three Months Ended March 31, 2018 2017 (as adjusted)* Class A Class B Class A Class B Net loss $ (5,646 ) $ (8,798 ) $ (7,436 ) $ (6,938 ) Weighted-average shares used to compute basic and diluted net loss per share 52,764 82,230 54,288 50,647 Basic and diluted net loss per share $ (0.11 ) $ (0.11 ) $ (0.14 ) $ (0.14 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following securities were excluded from the calculation of diluted net loss per share for common stock because their effect would have been anti-dilutive for the periods presented (in thousands): Three Months Ended March 31, 2018 2017 Stock options and restricted stock units 20,601 16,933 Warrants 115 2,020 Total 20,716 18,953

Summary of Significant Accoun31

Summary of Significant Accounting Policies - Summary of Significant Accounting Policies - Revenue Recognition- Income Statement (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization of deferred commissions		$ 2,853
Deferred Professional Service Costs		12,318		$ 12,480
Subscription		32,989
Professional services and other		3,490
Cost of professional services	[1]	5,769
Sales and marketing	[1]	13,912	$ 14,145
Operating Income (Loss)		(14,572)	(14,566)
Net loss		(14,444)	$ (14,374)
Stock-based compensation		$ 4,592
Net loss per share, basic and diluted		$ (0.11)	$ (0.14)
Deferred revenue		$ 3,183
Deferred Revenue		33,600		30,400
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization of deferred commissions			$ 1,933
Deferred Commissions			(557)	27,512
Deferred Professional Service Costs			(852)	12,480
Subscription			25,897
Professional services and other			1,806
Cost of professional services			3,809
Sales and marketing			14,145
Operating Income (Loss)			(14,566)
Net loss			(14,374)
Stock-based compensation			5,612
Amortizations Of Deferred Professional Costs			$ 887
Net loss per share, basic and diluted			$ (0.14)
Deferred Revenue			$ 3,129
Accounting Standards Update 2014-09 | Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization of deferred commissions			2,089
Deferred Commissions		$ 10,583	(416)
Deferred Professional Service Costs			0	0
Subscription			25,766
Professional services and other			1,979
Cost of professional services			3,988
Sales and marketing			14,443
Operating Income (Loss)			(15,001)
Net loss			(14,809)
Stock-based compensation			5,827
Amortizations Of Deferred Professional Costs			$ 0
Net loss per share, basic and diluted			$ (0.14)
Deferred Revenue			$ 3,087
Accounting Standards Update 2014-09 | Restatement Adjustment [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization of deferred commissions			(156)
Deferred Commissions			(141)	16,929
Deferred Professional Service Costs			(852)	$ 12,480
Subscription			131
Professional services and other			(173)
Cost of professional services			(179)
Sales and marketing			(298)
Operating Income (Loss)			435
Net loss			435
Stock-based compensation			(215)
Amortizations Of Deferred Professional Costs			$ 887
Net loss per share, basic and diluted			$ 0
Deferred Revenue			$ 42
[1]	Includes stock-based compensation expense as follows: Cost of subscription $120 and $67. Cost of professional services $535 and $450. Sales and marketing $2,219 and $2,074. Research and development $1,264 and $730. General and administrative $971 and $896.

Summary of Significant Accoun32

Summary of Significant Accounting Policies -Summary of Significant Accounting Policies - Revenue Recognition - Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue	$ 30,050
Deferred Professional Service Costs	12,318	$ 12,480
Deferred revenue, non-current	3,575
Accumulated deficit	(389,778)
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable And Others, Net		21,933
Deferred Commissions		27,512	$ (557)
Deferred revenue		25,985
Deferred Professional Service Costs		12,480	(852)
Deferred revenue, non-current		4,457
Accumulated deficit		(375,334)
Accounting Standards Update 2014-09 | Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable And Others, Net		20,761
Deferred Commissions	10,583		(416)
Deferred revenue	29,410
Deferred Professional Service Costs		0	0
Deferred revenue, non-current	6,686
Accumulated deficit	$ (411,569)
Accounting Standards Update 2014-09 | Restatement Adjustment [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts Receivable And Others, Net		1,172
Deferred Commissions		16,929	(141)
Deferred revenue		(3,425)
Deferred Professional Service Costs		12,480	$ (852)
Deferred revenue, non-current		(2,229)
Accumulated deficit		$ 36,235

Contract Balances and Perform33

Contract Balances and Performance Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Deferred Revenue	$ 33.6		$ 30.4
Contract with Customer, Asset, Net	1.7		$ 1.2
Deferred Revenue, Revenue Recognized	15.9	$ 12.1
Revenue, Remaining Performance Obligation	$ 174
Revenue, Remaining Performance Obligation, Percent	70.00%

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Marketable securities:
Marketable securities	$ 52,653	$ 56,506
Money market mutual funds
Marketable securities:
Marketable securities	8,159	6,115
U.S. agency obligations
Marketable securities:
Marketable securities	17,414	19,366
U.S. treasury securities
Marketable securities:
Marketable securities	27,080	31,025
Fair Value, Measurements, Recurring
Marketable securities:
Assets, Fair Value Disclosure	52,653	56,506
Fair Value, Measurements, Recurring | Money market mutual funds
Cash equivalents:
Cash equivalents	8,159	6,115
Fair Value, Measurements, Recurring | U.S. agency obligations
Cash equivalents:
Cash equivalents	16,562
Marketable securities:
Marketable securities	852	1,000
Fair Value, Measurements, Recurring | U.S. treasury securities
Cash equivalents:
Cash equivalents	1,500	18,366
Marketable securities:
Marketable securities	25,580	31,025
Fair Value, Measurements, Recurring | Level 1
Marketable securities:
Assets, Fair Value Disclosure	8,159	6,115
Fair Value, Measurements, Recurring | Level 1 | Money market mutual funds
Cash equivalents:
Cash equivalents	8,159	6,115
Fair Value, Measurements, Recurring | Level 1 | U.S. agency obligations
Cash equivalents:
Cash equivalents	0
Marketable securities:
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. treasury securities
Cash equivalents:
Cash equivalents	0	0
Marketable securities:
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2
Marketable securities:
Assets, Fair Value Disclosure	44,494	50,391
Fair Value, Measurements, Recurring | Level 2 | Money market mutual funds
Cash equivalents:
Cash equivalents	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. agency obligations
Cash equivalents:
Cash equivalents	16,562
Marketable securities:
Marketable securities	852	1,000
Fair Value, Measurements, Recurring | Level 2 | U.S. treasury securities
Cash equivalents:
Cash equivalents	1,500	18,366
Marketable securities:
Marketable securities	$ 25,580	$ 31,025

Marketable Securities (Details)

Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 52,673	$ 56,528
Unrealized Gains	1	0
Unrealized Losses	21	(22)
Fair Value	52,653	56,506
Included in cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,219	24,481
Unrealized Gains	1	0
Unrealized Losses	0	0
Fair Value	26,220	24,481
Included in marketable securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,454	32,047
Unrealized Gains	1	0
Unrealized Losses	21	(22)
Fair Value	26,433	32,025
U.S. agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,413	31,047
Unrealized Gains	1	0
Unrealized Losses	0	(22)
Fair Value	17,414	19,366
U.S. treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,101	19,366
Unrealized Gains	0	0
Unrealized Losses	(21)	0
Fair Value	27,080	31,025
Money market mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,159	6,115
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 8,159	$ 6,115

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 0
Available-for-sale Securities, Maturity Period	1 year	1 year

Business Combinations - Narrati

Business Combinations - Narrative (Details)	Apr. 03, 2017USD ($)shares
Business Acquisition [Line Items]
Ownership interest in Jiff (more than) (as a percent)	5.00%
Class B
Business Acquisition [Line Items]
Class B common stock acquired in exchange (in shares)	3,965,979
Jiff, Inc.
Business Acquisition [Line Items]
Shares and options paid to acquire business (in shares)	27,000,000
Benchmark for revenue in 2017 | $	$ 25,000,000
Benchmark for net new bookings in 2017 | $	25,000,000
Contingent consideration liability | $	$ 671,000
Jiff, Inc. | Class B
Business Acquisition [Line Items]
Aggregate shares awarded to certain stockholders and option holders for reaching revenue benchmark (in shares)	1,000,000
Aggregate shares awarded to certain stockholders and option holders for reaching net bookings benchmark (in shares)	3,000,000

Business Combinations - Summary

Business Combinations - Summary of the Components of the Purchase Consideration Transferred (Details) - Jiff, Inc. $ in Thousands	Apr. 03, 2017USD ($)
Business Acquisition [Line Items]
Fair value of Company Class B common stock (25,054,049 shares @ $3.65 per share)	$ 91,447
Fair value of contingent consideration	671
Fair value of assumed Jiff options attributable to pre-combination services	9,574
Transaction costs paid on behalf of Jiff	4,498
Estimated purchase price consideration	$ 106,190

Business Combinations - Schedul

Business Combinations - Schedule of Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Apr. 03, 2017
Business Acquisition [Line Items]
Goodwill	$ 91,785	$ 91,785
Jiff, Inc.
Business Acquisition [Line Items]
Cash			$ 2,234
Current assets			5,159
Other assets			1,971
Acquired intangible assets			23,900
Goodwill			91,785
Total assets acquired			125,049
Deferred revenue			(1,857)
Other current liabilities			(6,192)
Debt			(5,578)
Non-current liabilities			(5,232)
Total net assets acquired			$ 106,190

Business Combinations - Sched40

Business Combinations - Schedule of Identifiable Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 03, 2017	Mar. 31, 2018	Apr. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Fair Value		$ 23,900		$ 23,900
Customer relationships
Business Acquisition [Line Items]
Fair Value		$ 10,900		10,900
Useful Life		10 years
Developed technology
Business Acquisition [Line Items]
Fair Value		$ 10,600		10,600
Useful Life		5 years
Backlog
Business Acquisition [Line Items]
Fair Value		$ 1,500		1,500
Useful Life		3 years
Other acquired intangible assets
Business Acquisition [Line Items]
Fair Value		$ 900		$ 900
Minimum | Backlog
Business Acquisition [Line Items]
Useful Life	2 years		2 years
Minimum | Other acquired intangible assets
Business Acquisition [Line Items]
Useful Life	1 year		1 year
Maximum | Backlog
Business Acquisition [Line Items]
Useful Life	3 years		3 years
Maximum | Other acquired intangible assets
Business Acquisition [Line Items]
Useful Life	3 years		3 years

Business Combinations - Sched41

Business Combinations - Schedule of Unaudited Pro Forma Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Total revenue	$ 36,479	$ 31,345
Net loss	$ (14,444)	$ (18,467)

Property and equipment, net (De

Property and equipment, net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation Expense	$ 0.7	$ 0.7

Property and equipment, net - S

Property and equipment, net - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and Equipment	$ 14,399	$ 14,447
Internal-use software	2,925	2,925
Accumulated depreciation	(9,608)	(9,184)
Property and equipment, net	4,791	5,263
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	2,895	2,915
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	6,252	6,165
Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	1,149	1,149
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	$ 1,178	$ 1,293

Debt (Details)

Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Debt Instrument, Term	36 months
Early Repayment of Senior Debt	0.5	0.5
Long-term Debt	$ 5,578
Long-term Debt, Excluding Current Maturities	4,648	$ 4,958
Debt, Current	900
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000
Interest Rate Option 1
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.00%
Interest Rate Option 2
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%

Debt Debt- Future Maturities (D

Debt Debt- Future Maturities (Details) $ in Thousands	Mar. 31, 2018USD ($)
Line of Credit Facility [Line Items]
2,018	$ 620
2,019	1,859
2,020	1,859
2,021	1,240
Debt, Current	$ 900

Goodwill and Intangible Asset46

Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Net beginning balance	$ 91,785
Net ending balance	$ 91,785	$ 91,785
Jiff, Inc.
Goodwill [Roll Forward]
Net beginning balance		$ 91,785

Goodwill and Intangible Asset47

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Apr. 03, 2017	Mar. 31, 2018	Apr. 30, 2017
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross, beginning balance		$ 23,900
Intangible Assets, Gross, Additions		0
Intangible Assets, Gross, ending balance		23,900
Accumulated Amortization, beginning balance		(3,647)
Accumulated Amortization, Expense		(1,142)
Accumulated Amortization, ending balance		(4,789)
Acquired Intangibles, Net		19,111
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross, beginning balance		10,900
Intangible Assets, Gross, Additions		0
Intangible Assets, Gross, ending balance		10,900
Accumulated Amortization, beginning balance		(818)
Accumulated Amortization, Expense		(272)
Accumulated Amortization, ending balance		(1,090)
Acquired Intangibles, Net		$ 9,810
Useful Life		10 years
Developed technology
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross, beginning balance		$ 10,600
Intangible Assets, Gross, Additions		0
Intangible Assets, Gross, ending balance		10,600
Accumulated Amortization, beginning balance		(1,590)
Accumulated Amortization, Expense		(530)
Accumulated Amortization, ending balance		(2,120)
Acquired Intangibles, Net		$ 8,480
Useful Life		5 years
Backlog
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross, beginning balance		$ 1,500
Intangible Assets, Gross, Additions		0
Intangible Assets, Gross, ending balance		1,500
Accumulated Amortization, beginning balance		(664)
Accumulated Amortization, Expense		(148)
Accumulated Amortization, ending balance		(812)
Acquired Intangibles, Net		$ 688
Useful Life		3 years
Other acquired intangible assets
Finite-lived Intangible Assets [Roll Forward]
Intangible Assets, Gross, beginning balance		$ 900
Intangible Assets, Gross, Additions		0
Intangible Assets, Gross, ending balance		900
Accumulated Amortization, beginning balance		(575)
Accumulated Amortization, Expense		(192)
Accumulated Amortization, ending balance		(767)
Acquired Intangibles, Net		$ 133
Minimum | Backlog
Finite-lived Intangible Assets [Roll Forward]
Useful Life	2 years		2 years
Minimum | Other acquired intangible assets
Finite-lived Intangible Assets [Roll Forward]
Useful Life	1 year		1 year
Maximum | Backlog
Finite-lived Intangible Assets [Roll Forward]
Useful Life	3 years		3 years
Maximum | Other acquired intangible assets
Finite-lived Intangible Assets [Roll Forward]
Useful Life	3 years		3 years

Goodwill and Intangible Asset48

Goodwill and Intangible Assets - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,142

Goodwill and Intangible Asset49

Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) $ in Thousands	Mar. 31, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 2,902
2,018	3,505
2,019	3,242
2,020	3,210
2,021	1,620
Thereafter	4,632
Acquired Intangibles, Net	$ 19,111

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	Apr. 03, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Ownership interest in Jiff (more than) (as a percent)	5.00%
Initial Investment
Related Party Transaction [Line Items]
Payments to acquire interest in related party		$ 5.5
Other Operating Income (Expense), Net		1.4
Lyra
Related Party Transaction [Line Items]
Payments to acquire interest in related party		$ (4.1)
Class B
Related Party Transaction [Line Items]
Class B common stock acquired in exchange (in shares)	3,965,979

Stock Compensation - Summary of

Stock Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2018	Dec. 31, 2016
Equity and Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	9,646,285		10,335,178
Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 2.27		$ 2.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 19,253	$ 17,599
Number of PSUs granted	134,000
Restricted Stock Units granted (1)	$ 3.69
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(309,242)
Restricted Stock Units vested	$ 1.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(513,651)
Restricted Stock Units forfeited and canceled (2)	$ 14.37

Stock Compensation - Stock Opti

Stock Compensation - Stock Options Activity and Stock-based Compensation (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Equity and Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Granted, Value, Share-based Compensation, Gross	$ 0.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 5 months 9 days

Stock Compensation - Assumption

Stock Compensation - Assumptions Related to Share-based Compensation (Details)	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Stock Options, Activity	2.72% - 2.74%
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	6 years 22 days	0 years
Risk-free interest rate			1.37%
Monte Carlo [Member] | Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	57.00%	0.00%
Risk-free interest rate		0.00%
Dividend yield	0.00%	0.00%
Minimum | Monte Carlo [Member] | Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.72%
Maximum | Monte Carlo [Member] | Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.74%

Stock Compensation - Summary 54

Stock Compensation - Summary of Restricted Stock Unit Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance as of December 31, 2017	9,646,285	10,335,178
Restricted Stock Units granted (1)		134,000
Restricted Stock Units vested		309,242
Restricted Stock Units forfeited and canceled (2)		513,651
Balance as of March 31, 2018		9,646,285
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Balance as of December 31, 2017	$ 2.27	$ 2.83
Restricted Stock Units granted (1)		3.69
Restricted Stock Units vested		1.58
Restricted Stock Units forfeited and canceled (2)		14.37
Balance as of March 31, 2018		$ 2.27
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 5 months 9 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance as of December 31, 2017	9,334,000
Restricted Stock Units granted (1)	3,835,000
Restricted Stock Units vested	(747,000)
Restricted Stock Units forfeited and canceled (2)	(1,467,000)
Balance as of March 31, 2018	10,954,000	9,334,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Balance as of December 31, 2017	$ 4.03
Restricted Stock Units granted (1)	3.63
Restricted Stock Units vested	4.38
Restricted Stock Units forfeited and canceled (2)	3.59
Balance as of March 31, 2018	$ 3.93	$ 4.03
Unrecognized compensation cost	$ 39
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 10 months 6 days
Performance awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted Stock Units granted (1)	600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Compensation expense recognized	$ 0.2
Vesting percentage in year 1 | Performance awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vesting percentage	50.00%
Vesting percentage in year 2 | Performance awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vesting percentage	50.00%
Minimum | Performance awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Shares the will eventually vest (as a percent)	0.00%
Maximum | Performance awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Shares the will eventually vest (as a percent)	150.00%

Stock Compensation - Narrative

Stock Compensation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Number of PSUs granted		134,000
PSUs
Business Acquisition [Line Items]
Allocated Share-based Compensation Expense	$ 0.2
Number of PSUs granted	600,000

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Increase (decrease) In rent expense	$ 2.4
Operating Leases, Rent Expense, Sublease Rentals		$ 0.9

Stockholders' Equity Narrative

Stockholders' Equity Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 24, 2017	May 31, 2016	May 31, 2016	Dec. 31, 2017	Mar. 31, 2018
Class of Stock [Line Items]
Class Of Warrant Or Right, Initial Expiration Period	4 years
Class Of Warrant Or Right, Amended Expiration Period	4 years
Issuance of Stock and Warrants for Services or Claims				$ 1,100
Class A
Class of Stock [Line Items]
Common Stock, Shares, Issued					52,432,553
Class B
Class of Stock [Line Items]
Common Stock, Shares, Issued					83,163,275
SAP Technologies, Inc.
Class of Stock [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 4.91	$ 4.91
SAP Technologies, Inc. | Class B
Class of Stock [Line Items]
Shares issued during the period			4,700,000
Number of Securities Called by Warrants or Rights (in shares)		1,900,000	1,900,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Value		$ 17,800

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2016	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	0.00%	0.00%
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense			$ 54.6

Net Loss per Share - Calculatio

Net Loss per Share - Calculation of Basic and Diluted EPS for Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] [Line Items]
Net loss	$ (14,444)	$ (14,374)
Weighted-average shares used to compute basic and diluted net loss per share	134,994	104,935
Basic and diluted net loss per share (in usd per share)	$ (0.11)	$ (0.14)
Class A
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] [Line Items]
Net loss	$ (5,646)	$ (7,436)
Weighted-average shares used to compute basic and diluted net loss per share	52,764	54,288
Basic and diluted net loss per share (in usd per share)	$ (0.11)	$ (0.14)
Class B
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] [Line Items]
Net loss	$ (8,798)	$ (6,938)
Weighted-average shares used to compute basic and diluted net loss per share	82,230	50,647
Basic and diluted net loss per share (in usd per share)	$ (0.11)	$ (0.14)

Net Loss per Share - Summary of

Net Loss per Share - Summary of Antidilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	May 31, 2016
Class A
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20,716,000	18,953,000
Class A | Stock options and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20,601,000	16,933,000
Class A | Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	115,000	2,020,000
SAP Technologies, Inc. | Class B
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of Securities Called by Warrants or Rights (in shares)			1,900,000

Deferred Costs (Details)

Deferred Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Sales Commission	$ 25,830	$ 27,512
Deferred Commissions, Additions	1,171
Deferred Commissions, Expense Recognized	(2,853)
Deferred Professional Service Costs	12,318	12,480
Deferred Professional Service Costs, Additions	784
Deferred Professional Service Costs, Expense Recognized	(946)
Deferred Commissions and Professional Service Costs	38,148	$ 39,992
Total Deferred Commissions And Professional Service Costs, Additions	1,955
Total Deferred Commissions And Professionals Service Costs	$ (3,799)