Castlight Health (CSLT) 10-Q 12 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	8-May-15
Class of Stock [Line Items]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	CSLT
Entity Registrant Name	CASTLIGHT HEALTH, INC.
Entity Central Index Key	1433714
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		58,411,009
Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		35,362,942

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$27,041	$17,425
Marketable securities	158,730	175,057
Accounts receivable, net	10,488	11,097
Deferred commissions	3,642	3,675
Prepaid expenses and other current assets	3,499	3,476
Total current assets	203,400	210,730
Property and equipment, net	3,497	3,630
Marketable securities, noncurrent	0	6,220
Deferred commissions, noncurrent	2,377	2,563
Other assets	78	131
Total assets	209,352	223,274
Current liabilities:
Accounts payable	4,169	3,217
Accrued expenses and other current liabilities	4,365	5,791
Accrued compensation	7,378	10,455
Deferred revenue	24,002	20,708
Total current liabilities	39,914	40,171
Deferred revenue, noncurrent	7,079	6,652
Other liabilities, noncurrent	226	261
Total liabilities	47,219	47,084
Commitments and contingencies
Stockholders’ equity (deficit):
Additional paid-in capital	398,941	393,397
Accumulated other comprehensive income	2	-40
Accumulated deficit	-236,819	-217,176
Total stockholders’ equity (deficit)	162,133	176,190
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	209,352	223,274
Class A [Member]
Stockholders’ equity (deficit):
Common stock value issued	6	6
Class B [Member]
Stockholders’ equity (deficit):
Common stock value issued	$3	$3

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Revenue:
Subscription	$14,906		$7,463
Professional services	1,045		913
Total revenue	15,951		8,376
Cost of revenue:
Cost of subscription	2,519	[1]	2,712	[1]
Cost of professional services	4,653	[1]	3,871	[1]
Total cost of revenue	7,172		6,583
Gross profit	8,779		1,793
Operating expenses:
Sales and marketing	16,463	[1]	16,560	[1]
Research and development	6,594	[1]	5,527	[1]
General and administrative	5,463	[1]	4,010	[1]
Total operating expenses	28,520		26,097
Operating loss	-19,741		-24,304
Other income, net	98		23
Net loss	($19,643)		($24,281)
Net loss per Class A and B share, basic and diluted	($0.21)		($0.90)
Weighted-average shares used to compute basic and diluted net loss per Class A and B share	91,786		26,970
[1]	Includes stock-based compensation expense as follows: Cost of subscription $33 and $4. Cost of professional services $425 and $140. Sales and marketing $1,751 and $1,174. Research and development $633 and $421. General and administrative $1,027 and $814

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations Parenthetical (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cost of subscription [Member]
Allocated Share-based Compensation Expense	$33	$4
Cost of professional services [Member]
Allocated Share-based Compensation Expense	425	140
Sales and marketing [Member]
Allocated Share-based Compensation Expense	1,751	1,174
Research and development [Member]
Allocated Share-based Compensation Expense	633	421
General and administrative [Member]
Allocated Share-based Compensation Expense	$1,027	$814

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Consolidated Statement of Comprehensive Loss:
Net loss	($19,643)	($24,281)
Other comprehensive income:
Net change in unrealized gain on available-for-sale marketable securities	42	1
Reclassification adjustments for net realized gains on available-for-sale marketable securities	0	0
Other comprehensive income	42	1
Comprehensive loss	($19,601)	($24,280)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net loss	($19,643)	($24,281)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	454	282
Stock-based compensation	3,869	2,553
Amortization of deferred commissions	857	1,376
Accretion and amortization of marketable securities	443	124
Expense related to warrant	0	2,429
Changes in operating assets and liabilities:
Accounts receivable	609	-1,250
Deferred commissions	-638	-282
Prepaid expenses and other assets	30	-1,081
Accounts payable	1,512	759
Accrued expenses and other liabilities	-4,403	-3,376
Deferred revenue	3,721	6,686
Net cash used in operating activities	-13,189	-16,061
Investing activities:
Purchase of property and equipment	-887	-656
Purchase of marketable securities	-13,034	-35,733
Sale of marketable securities	5,000	13,000
Maturities of marketable securities	30,180	5,000
Net cash provided by (used in) investing activities	21,259	-18,389
Financing activities:
Proceeds from the exercise of stock options	1,640	1,522
Net proceeds from initial public offering	0	189,943
Payments of deferred offering costs	-94	-2,102
Net cash provided by financing activities	1,546	189,363
Net increase in cash and cash equivalents	9,616	154,913
Cash and cash equivalents at beginning of period	17,425	25,154
Cash and cash equivalents at end of period	$27,041	$180,067

Organization_and_Description_o

Organization and Description of Business	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business
	Description of Business
	Castlight Health, Inc. (Castlight) is a pioneer in a new category of cloud-based software that enables enterprises to understand and manage health care spending as a strategic business investment, and help employees and their families make more informed medical decisions based on factors such as cost, quality and patient experience. Our Enterprise Healthcare Cloud allows our customers to conquer the complexity of the existing health care system by providing personalized, actionable information to their employees, implementing technology-enabled benefit designs and integrating disparate systems and applications. Our comprehensive technology offering aggregates complex, large-scale data and applies sophisticated analytics to make health care data transparent and useful. We were incorporated in the State of Delaware in January 2008. Our principal executive offices are located in San Francisco, California.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	Basis of Presentation and Principles of Consolidation
	The accompanying unaudited condensed consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (GAAP), for interim financial information and with the instructions to Form 10-Q and Article 10 of Securities and Exchange Commission (SEC), Regulation S-X. 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 condensed consolidated financial statements include the results of Castlight and its wholly owned U.S. subsidiary. The results for the interim periods presented are not necessarily indicative of the results expected for any future period.
	The condensed consolidated balance sheet as of December 31, 2014 included herein was derived from the audited financial statements as of that date. The following information should be read in conjunction with the audited financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2014. There have been no changes to our significant accounting policies described in our Annual Report on Form 10-K that have had a material impact on our condensed consolidated financial statements and related notes.
	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with GAAP requires us 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 relative selling prices for our services and certain assumptions used in the valuation of our equity awards. Actual results could differ from those estimates, and such differences could be material to our consolidated financial position and results of operations.
	Recently Issued and Adopted Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09 regarding ASC Topic 606, Revenue from Contracts with Customers. The standard provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance will be effective for us beginning January 1, 2017. Early adoption is not permitted. We are evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.

Marketable_Securities

Marketable Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities
	At March 31, 2015 and December 31, 2014, respectively, marketable securities consisted of the following (in thousands):
		Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	March 31, 2015
	U.S. agency obligations	$	153,201	$	12	$	(10	)	$	153,203
	U.S. treasury securities	5,526		1		—			5,527
	Money market mutual funds	13,199		—		—			13,199
		171,926		13		(10		)	171,929
	Included in cash and cash equivalents	13,199		—		—			13,199
	Included in marketable securities	$	158,727	$	13	$	(10	)	$	158,730
		Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	December 31, 2014
	U.S. agency obligations	$	177,297	$	4	$	(44	)	$	177,257
	U.S. treasury securities	5,580		1		—			5,581
	Money market mutual funds	1,919		—		—			1,919
		184,796		5		(44		)	184,757
	Included in cash and cash equivalents	3,480		—		—			3,480
	Included in marketable securities	$	175,093	$	5	$	(41	)	$	175,057
	Included in marketable securities, noncurrent	$	6,223	$	—	$	(3	)	$	6,220

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy that requires that we 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. We have no financial assets or liabilities measured using Level 3 inputs. There were no significant transfers between Levels 1 and 2 assets as of March 31, 2015 and December 31, 2014. The following tables present information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
		Level 1		Level 2		Total
	31-Mar-15
	Cash equivalents:
	Money market mutual funds	$	13,199	$	—	$	13,199
	Marketable securities:
	U.S. agency obligations	—		153,203		153,203
	U.S. treasury securities	—		5,527		5,527
		$	13,199	$	158,730	$	171,929
		Level 1		Level 2		Total
	December 31, 2014
	Cash equivalents:
	Money market mutual funds	$	1,919	$	—	$	1,919
	U.S. agency obligations	—		1,561		1,561
	Marketable securities:
	U.S. agency obligations	—		175,696		175,696
	U.S. treasury securities	—		5,581		5,581
		$	1,919	$	182,838	$	184,757
	Gross unrealized gains and losses for cash equivalents and marketable securities as of March 31, 2015 and December 31, 2014 were not material. We do not believe the unrealized losses represent other-than-temporary impairments based on our evaluation of available evidence as of March 31, 2015.
	There were no realized gains or losses during the three months ended March 31, 2015. All of our marketable securities at March 31, 2015 mature within one year. As of December 31, 2014 those securities with maturities at the time of purchase of greater than one year are reflected in the noncurrent portion of our condensed consolidated balance sheets. 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.

Property_and_equipment_net

Property and equipment, net	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property and equipment	Property and Equipment
	Property and equipment consisted of the following (in thousands):
		As of
		March 31, 2015			December 31, 2014
	Leasehold improvements	$	1,065		$	1,058
	Computer equipment	3,279			3,247
	Software	874			874
	Capitalization of internal-use software	572			291
	Furniture and equipment	302			301
	Total	6,092			5,771
	Accumulated depreciation	(2,595		)	(2,141		)
	Property and equipment, net	$	3,497		$	3,630
	Depreciation and amortization expense for the three months ended March 31, 2015 and 2014, was $0.5 million and $0.3 million, respectively. Depreciation is recorded on a straight-line basis.

Deferred_Revenue

Deferred Revenue	3 Months Ended
	Mar. 31, 2015
Deferred Revenue Disclosure [Abstract]
Deferred Revenue	Deferred Revenue
	Deferred revenue consisted of the following (in thousands):
		As of
		March 31, 2015		December 31, 2014
	Subscription	$	17,342	$	14,826
	Professional services—implementation	3,457		2,974
	Professional services—communications	3,203		2,908
	Total current	24,002		20,708
	Subscription	1,960		1,950
	Professional services—implementation	4,612		4,327
	Professional services—communications	507		375
	Total noncurrent	7,079		6,652
	Total	$	31,081	$	27,360

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Legal Matters
	On April 2, April 16, April 29, and May 4, 2015, purported securities class action lawsuits were filed in the Superior Court of the State of California, County of San Mateo, against us, certain of our current and former directors, executive officers, significant stockholders and underwriters associated with our IPO. The lawsuits were brought by purported stockholders of our company seeking to represent a class consisting of all those who purchased our stock pursuant and/or traceable to the Registration Statement and Prospectus issued in connection with our IPO. The lawsuits assert claims under Sections 11, 12(a)(2) and 15 of the Securities Act of 1933 and seek unspecified damages and other relief. We believe that the claims are without merit and intend to defend the lawsuits vigorously.
	From time to time, we may become subject to other legal proceedings, claims or litigation arising in the ordinary course of business. In addition, we may receive letters alleging infringement of patents or other intellectual property rights. We do not believe that any liability from any reasonably foreseeable disposition of these legal actions and claims, individually or in the aggregate, would have a material effect on our business, operating results, cash flows or financial condition. The lawsuits described above are still in their early stages and the final outcome, including our liability, if any, with respect to the claims in the lawsuits, are uncertain. If an unfavorable outcome were to occur in the litigation, the impact could be material to our business, financial condition, cash flow or results of operations, depending on the specific circumstances of the outcome. We cannot make a reasonable estimate of the potential loss or range of loss, if any, arising from these matters. We accrue for loss contingencies when it is both probable that we will incur the loss and when we can reasonably estimate the amount of the loss or range of loss. If we determine that a loss is reasonably possible and can reasonably estimate the range of the loss, then we disclose the range of the loss.

Stockholders_Equity_Deficit

Stockholders' Equity (Deficit)	3 Months Ended
	Mar. 31, 2015
Equity and Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity (Deficit)	Stockholders’ Equity
	Common Stock
	As of March 31, 2015, we had 58,442,009 shares of Class A common stock and 34,628,791 shares of Class B common stock outstanding.
	Stock Options Activity
	A summary of stock option activity for the three months ended March 31, 2015 is as follows (in thousands, except share and per share amounts):
		Options			Weighted-		Aggregate
		Outstanding			Average		Intrinsic
					Exercise		Value
					Price
	Balance at December 31, 2014	16,392,539			$	4.4	$	128,541
	Stock option grants	466,900			$	8.88
	Stock options exercised	(1,925,731	)		$	1.02
	Stock options canceled	(1,016,745	)		$	7.12
	Balance at March 31, 2015	13,916,963			$	4.82	$	61,110
	The total grant-date fair value of stock options granted during the three months ended March 31, 2015 and 2014 was $2.1 million and $25.9 million, respectively.
	The fair value of each option grant was estimated on the date of grant using the Black-Scholes option-valuation model with the following assumptions and fair value per share:
		Three Months Ended March 31,
		2015		2014
	Volatility	53%		60%
	Expected life (in years)	6.2		5.0-6.2
	Risk-free interest rate	1.38%-1.79%		1.53%-1.95%
	Dividend yield	—%		—%
	As of March 31, 2015, we had $32.6 million in unrecognized compensation cost related to non-vested stock options, which is expected to be recognized over a weighted-average period of approximately 3.0 years.
	Restricted Stock Units
	A summary of restricted stock unit activity for the three months ended March 31, 2015 is as follows (in thousands, except share and per share amounts):
		Number of			Weighted-
		Shares			Average
		Outstanding			Grant Date Fair Value
	Balance at December 31, 2014	1,398,893			$	11.06
	Restricted Stock Units granted	666,300			$	9.13
	Restricted Stock Units vested	—			$	—
	Restricted Stock Units forfeited	(131,600	)		$	10.4
	Balance at March 31, 2015	1,933,593			$	10.44
	As of March 31, 2015, there was a total of $20.2 million in unrecognized compensation cost related to restricted stock units, which is expected to be recognized over a weighted-average period of approximately 3.9 years.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The effective tax rate for the three months ended March 31, 2015 and 2014 was zero percent, primarily as a result of the estimated tax loss for the year and the change in valuation allowance.
	There were no material changes to the unrecognized tax benefits in the three months ended March 31, 2015, and we do not anticipate that the unrecognized tax benefits will significantly increase or decrease in the next 12 months. At March 31, 2015, all unrecognized tax benefits are subject to a full valuation allowance and, if recognized, will not affect the effective tax rate.

Net_Loss_per_Share

Net Loss per Share	3 Months Ended
	Mar. 31, 2015
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 our common stock (in thousands, except per share data):
		Three Months Ended March 31,
		2015							2014
		Class A				Class B			Class A			Class B
	Net loss	$	(12,562	)		$	(7,081	)	$	(21,983	)	$	(2,298	)
	Weighted-average shares used to compute basic and diluted net loss per share	58,698				33,088			24,417			2,553
	Basic and diluted net loss per share	$	(0.21	)		$	(0.21	)	$	(0.90	)	$	(0.90	)
	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,
		2015			2014
	Stock options and restricted common stock	15,898			17,931
	Warrants	115			115
	Total	16,013			18,046

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
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 were prepared in accordance with U.S. generally accepted accounting principles (GAAP), for interim financial information and with the instructions to Form 10-Q and Article 10 of Securities and Exchange Commission (SEC), Regulation S-X. 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 condensed consolidated financial statements include the results of Castlight and its wholly owned U.S. subsidiary. The results for the interim periods presented are not necessarily indicative of the results expected for any future period.
	The condensed consolidated balance sheet as of December 31, 2014 included herein was derived from the audited financial statements as of that date. The following information should be read in conjunction with the audited financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2014. There have been no changes to our significant accounting policies described in our Annual Report on Form 10-K that have had a material impact on our condensed consolidated financial statements and related notes.
Use of Estimates	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with GAAP requires us 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 relative selling prices for our services and certain assumptions used in the valuation of our equity awards. Actual results could differ from those estimates, and such differences could be material to our consolidated financial position and results of operations.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued and Adopted Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09 regarding ASC Topic 606, Revenue from Contracts with Customers. The standard provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance will be effective for us beginning January 1, 2017. Early adoption is not permitted. We are evaluating the accounting, transition and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.

Marketable_Securities_Tables

Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	At March 31, 2015 and December 31, 2014, respectively, marketable securities consisted of the following (in thousands):
		Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	March 31, 2015
	U.S. agency obligations	$	153,201	$	12	$	(10	)	$	153,203
	U.S. treasury securities	5,526		1		—			5,527
	Money market mutual funds	13,199		—		—			13,199
		171,926		13		(10		)	171,929
	Included in cash and cash equivalents	13,199		—		—			13,199
	Included in marketable securities	$	158,727	$	13	$	(10	)	$	158,730
		Amortized		Unrealized		Unrealized			Fair Value
		Cost		Gains		Losses
	December 31, 2014
	U.S. agency obligations	$	177,297	$	4	$	(44	)	$	177,257
	U.S. treasury securities	5,580		1		—			5,581
	Money market mutual funds	1,919		—		—			1,919
		184,796		5		(44		)	184,757
	Included in cash and cash equivalents	3,480		—		—			3,480
	Included in marketable securities	$	175,093	$	5	$	(41	)	$	175,057
	Included in marketable securities, noncurrent	$	6,223	$	—	$	(3	)	$	6,220

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following tables present information about our assets that are measured at fair value on a recurring basis using the above input categories (in thousands):
		Level 1		Level 2		Total
	31-Mar-15
	Cash equivalents:
	Money market mutual funds	$	13,199	$	—	$	13,199
	Marketable securities:
	U.S. agency obligations	—		153,203		153,203
	U.S. treasury securities	—		5,527		5,527
		$	13,199	$	158,730	$	171,929
		Level 1		Level 2		Total
	December 31, 2014
	Cash equivalents:
	Money market mutual funds	$	1,919	$	—	$	1,919
	U.S. agency obligations	—		1,561		1,561
	Marketable securities:
	U.S. agency obligations	—		175,696		175,696
	U.S. treasury securities	—		5,581		5,581
		$	1,919	$	182,838	$	184,757

Property_and_equipment_net_Tab

Property and equipment, net (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property and equipment consisted of the following (in thousands):
		As of
		March 31, 2015			December 31, 2014
	Leasehold improvements	$	1,065		$	1,058
	Computer equipment	3,279			3,247
	Software	874			874
	Capitalization of internal-use software	572			291
	Furniture and equipment	302			301
	Total	6,092			5,771
	Accumulated depreciation	(2,595		)	(2,141		)
	Property and equipment, net	$	3,497		$	3,630

Deferred_Revenue_Tables

Deferred Revenue (Tables)	3 Months Ended
	Mar. 31, 2015
Deferred Revenue Disclosure [Abstract]
Deferred Revenue, by Arrangement, Disclosure	Deferred revenue consisted of the following (in thousands):
		As of
		March 31, 2015		December 31, 2014
	Subscription	$	17,342	$	14,826
	Professional services—implementation	3,457		2,974
	Professional services—communications	3,203		2,908
	Total current	24,002		20,708
	Subscription	1,960		1,950
	Professional services—implementation	4,612		4,327
	Professional services—communications	507		375
	Total noncurrent	7,079		6,652
	Total	$	31,081	$	27,360

Stockholders_Equity_Deficit_Ta

Stockholders' Equity (Deficit) (Tables)	3 Months Ended
	Mar. 31, 2015
Equity and Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A summary of stock option activity for the three months ended March 31, 2015 is as follows (in thousands, except share and per share amounts):
		Options			Weighted-		Aggregate
		Outstanding			Average		Intrinsic
					Exercise		Value
					Price
	Balance at December 31, 2014	16,392,539			$	4.4	$	128,541
	Stock option grants	466,900			$	8.88
	Stock options exercised	(1,925,731	)		$	1.02
	Stock options canceled	(1,016,745	)		$	7.12
	Balance at March 31, 2015	13,916,963			$	4.82	$	61,110
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of each option grant was estimated on the date of grant using the Black-Scholes option-valuation model with the following assumptions and fair value per share:
		Three Months Ended March 31,
		2015		2014
	Volatility	53%		60%
	Expected life (in years)	6.2		5.0-6.2
	Risk-free interest rate	1.38%-1.79%		1.53%-1.95%
	Dividend yield	—%		—%

Net_Loss_per_Share_Tables

Net Loss per Share (Tables)	3 Months Ended
	Mar. 31, 2015
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 our common stock (in thousands, except per share data):
		Three Months Ended March 31,
		2015							2014
		Class A				Class B			Class A			Class B
	Net loss	$	(12,562	)		$	(7,081	)	$	(21,983	)	$	(2,298	)
	Weighted-average shares used to compute basic and diluted net loss per share	58,698				33,088			24,417			2,553
	Basic and diluted net loss per share	$	(0.21	)		$	(0.21	)	$	(0.90	)	$	(0.90	)
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,
		2015			2014
	Stock options and restricted common stock	15,898			17,931
	Warrants	115			115
	Total	16,013			18,046

Marketable_Securities_Details

Marketable Securities (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Document Period End Date	31-Mar-15
Amortized Cost	$171,926	$184,796
Unrealized Gains	13	5
Unrealized Losses	-10	-44
Fair Value	171,929	184,757
Included in cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,199	3,480
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	13,199	3,480
Included in marketable securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	158,727	175,093
Unrealized Gains	13	5
Unrealized Losses	-10	-41
Fair Value	158,730	175,057
Included in marketable securities, noncurrent [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6,223
Unrealized Gains		0
Unrealized Losses		-3
Fair Value		6,220
U.S. agency obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	153,201	177,297
Unrealized Gains	12	4
Unrealized Losses	-10	-44
Fair Value	153,203	177,257
U.S. treasury securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,526	5,580
Unrealized Gains	1	1
Unrealized Losses	0	0
Fair Value	5,527	5,581
Money market mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,199	1,919
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$13,199	$1,919

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Available-for-sale Securities, Gross Realized Gain (Loss)	$0
Available-for-sale Securities, Maturity Period	1 year

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Assets Measured at Fair Value on a Recurring Basis (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Document Period End Date	31-Mar-15
Marketable securities:
Marketable securities	$171,929	$184,757
Money market mutual funds [Member]
Marketable securities:
Marketable securities	13,199	1,919
U.S. agency obligations [Member]
Marketable securities:
Marketable securities	153,203	177,257
U.S. treasury securities [Member]
Marketable securities:
Marketable securities	5,527	5,581
Fair Value, Measurements, Recurring
Marketable securities:
Assets, Fair Value Disclosure	171,929	184,757
Fair Value, Measurements, Recurring | Money market mutual funds [Member]
Cash equivalents:
Cash equivalents	13,199	1,919
Fair Value, Measurements, Recurring | U.S. agency obligations [Member]
Cash equivalents:
Cash equivalents		1,561
Marketable securities:
Marketable securities	153,203	175,696
Fair Value, Measurements, Recurring | U.S. treasury securities [Member]
Marketable securities:
Marketable securities	5,527	5,581
Fair Value, Measurements, Recurring | Level 1 [Member]
Marketable securities:
Assets, Fair Value Disclosure	13,199	1,919
Fair Value, Measurements, Recurring | Level 1 [Member] | Money market mutual funds [Member]
Cash equivalents:
Cash equivalents		1,919
Fair Value, Measurements, Recurring | Level 1 [Member] | U.S. agency obligations [Member]
Cash equivalents:
Cash equivalents		0
Marketable securities:
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 1 [Member] | U.S. treasury securities [Member]
Marketable securities:
Marketable securities	0	0
Fair Value, Measurements, Recurring | Level 2 [Member]
Marketable securities:
Assets, Fair Value Disclosure	158,730	182,838
Fair Value, Measurements, Recurring | Level 2 [Member] | Money market mutual funds [Member]
Cash equivalents:
Cash equivalents	0	0
Fair Value, Measurements, Recurring | Level 2 [Member] | U.S. agency obligations [Member]
Cash equivalents:
Cash equivalents		1,561
Marketable securities:
Marketable securities		175,696
Fair Value, Measurements, Recurring | Level 2 [Member] | U.S. treasury securities [Member]
Marketable securities:
Marketable securities		$5,581

Property_and_equipment_net_Det

Property and equipment, net (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation Expense	$0.50	$0.30

Property_and_equipment_net_Sch

Property and equipment, net - Schedule of Property, Plant and Equipment (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property and Equipment	$6,092	$5,771
Capitalization of internal-use software	572	291
Accumulated depreciation	-2,595	-2,141
Property and equipment, net	3,497	3,630
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	1,065	1,058
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	3,279	3,247
Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	874	874
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	$302	$301

Deferred_Revenue_Components_of

Deferred Revenue - Components of Deferred Revenue (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Deferred Revenue Arrangement [Line Items]
Total current	$24,002	$20,708
Total noncurrent	7,079	6,652
Total	31,081	27,360
Subscription [Member]
Deferred Revenue Arrangement [Line Items]
Total current	17,342	14,826
Total noncurrent	1,960	1,950
Professional Services - Implementation [Member]
Deferred Revenue Arrangement [Line Items]
Total current	3,457	2,974
Total noncurrent	4,612	4,327
Professional Services - Communications [Member]
Deferred Revenue Arrangement [Line Items]
Total current	3,203	2,908
Total noncurrent	$507	$375

Stockholders_Equity_Deficit_Su

Stockholders' Equity (Deficit) - Summary of Stock by Class (Details)	3 Months Ended
	Mar. 31, 2015
Class of Stock [Line Items]
Document Period End Date	31-Mar-15
Class A [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued	58,442,009
Class B [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued	34,628,791

Stockholders_Equity_Deficit_Su1

Stockholders' Equity (Deficit) - Summary of Stock Option Activity (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015
Options Outstanding
Beginning Balance	16,392,539,000
Stock option grants	466,900,000
Stock options exercised	-1,925,731,000
Stock options canceled	-1,016,745,000
Ending Balance	13,916,963,000
Weighted- Average Exercise Price
Beginning Balance	$4.82
Stock option grants	$8.88
Stock options exercised	$1.02
Stock options canceled	$7.12
Ending Balance	$4.40
Aggregate Intrinsic Value
Beginning Balance	$128,541
Ending Balance	$61,110

Stockholders_Equity_Deficit_St

Stockholders' Equity (Deficit) - Stock Options Activity and Stock-based Compensation (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Equity and Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Granted, Value, Share-based Compensation, Gross	$2.10	$25.90
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$32.60
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 11 months 23 days

Stockholders_Equity_Deficit_As

Stockholders' Equity (Deficit) - Assumptions Related to Share-based Compensation (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	31-Mar-15
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	53.00%	60.00%
Risk-free interest rate, minimum	1.38%	0.70%
Risk-free interest rate, maximum	1.79%	1.80%
Dividend yield	0.00%	0.00%
Minimum [Member] | Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	53.00%	57.80%
Expected life (in years)	6 years 2 months 12 days	5 years
Maximum [Member] | Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility		60.00%
Expected life (in years)		6 years 6 months

Stockholders_Equity_Deficit_Su2

Stockholders' Equity (Deficit) - Summary of Restricted Stock Unit Activity (Details) (USD $)	3 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 11 months 23 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at December 31, 2014	1,398,893
Restricted Stock Units granted	666,300
Restricted Stock Units vested	0
Restricted Stock Units forfeited	-131,600
Balance at March 31, 2015	1,933,593
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Balance at December 31, 2014	11.06
Restricted Stock Units granted	9.13
Restricted Stock Units vested	0
Restricted Stock Units forfeited	10.4
Balance at March 31, 2015	10.44
Unrecognized compensation cost	20.2
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 years 11 months 1 day

Income_Taxes_Details

Income Taxes (Details)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.00%	0.00%

Net_Loss_per_Share_Calculation

Net Loss per Share - Calculation of Basic and Diluted EPS for Common Stock (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] [Line Items]
Net loss	($19,643)	($24,281)
Weighted-average shares used to compute basic and diluted net loss per Class A and B share	91,786	26,970
Basic and diluted net loss per share (in usd per share)	($0.21)	($0.90)
Class A [Member]
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] [Line Items]
Net loss	-12,562	-21,983
Weighted-average shares used to compute basic and diluted net loss per Class A and B share	58,698	24,417
Basic and diluted net loss per share (in usd per share)	($0.21)	($0.90)
Class B [Member]
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] [Line Items]
Net loss	($7,081)	($2,298)
Weighted-average shares used to compute basic and diluted net loss per Class A and B share	33,088	2,553
Basic and diluted net loss per share (in usd per share)	($0.21)	($0.90)

Net_Loss_per_Share_Summary_of_

Net Loss per Share - Summary of Antidilutive Securities (Details) (Class A [Member])	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	16,013	18,046
Stock Options and Restricted Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	15,898	17,931
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	115	115