Opower 10-K 7 Mar 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 29, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	OPWR
Entity Registrant Name	OPOWER, INC.
Entity Central Index Key	1,412,043
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		53,179,995
Entity Public Float			$ 230,300,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 25,931	$ 125,725
Short-term investments	35,017
Accounts receivable, net	52,655	36,295
Prepaid expenses and other current assets	5,528	4,654
Total current assets	119,131	166,674
Long-term investments	36,464
Property and equipment, net	17,879	17,672
Other assets	287	151
Total assets	173,761	184,497
Current liabilities:
Accounts payable	2,273	1,400
Accrued expenses	7,403	6,367
Deferred revenue	71,646	61,989
Accrued compensation and benefits	10,874	8,337
Other current liabilities	1,659	2,091
Total current liabilities	93,855	80,184
Deferred revenue	1,676	2,280
Other liabilities	95	1,232
Total liabilities	$ 95,626	$ 83,696
Commitments and contingencies (see Note 7)
Stockholders' equity:
Preferred stock, par value $0.000005 per share-25,000 shares authorized; none issued and outstanding as of December 31, 2015 and December 31, 2014
Common stock, par value $0.000005 per share-500,000 shares authorized; 52,557 and 50,372 shares issued and outstanding as of December 31, 2015 and December 31, 2014, respectively	$ 0	$ 0
Additional paid-in capital	248,521	226,093
Accumulated deficit	(169,853)	(124,994)
Accumulated other comprehensive loss	(533)	(298)
Total stockholders' equity	78,135	100,801
Total liabilities and stockholders' equity	$ 173,761	$ 184,497

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.000005	$ 0.000005
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.000005	$ 0.000005
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	52,557,000	50,372,000
Common stock, shares outstanding	52,557,000	50,372,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Subscription	$ 131,778	$ 115,477	$ 82,315
Services	16,913	12,962	6,388
Total revenue	148,691	128,439	88,703
Cost of revenue:
Subscription	39,917	32,017	24,294
Services	16,146	12,108	7,798
Total cost of revenue	56,063	44,125	32,092
Gross profit	92,628	84,314	56,611
Operating expenses:
Sales and marketing	62,940	61,267	33,116
Research and development	54,095	45,999	29,496
General and administrative	18,988	17,844	7,816
Total operating expenses	136,023	125,110	70,428
Operating loss	(43,395)	(40,796)	(13,817)
Other income (expense):
Loss on foreign currency	(1,320)	(1,361)	(220)
Interest expense	(49)	(114)	(187)
Other, net	281	433	86
Loss before income taxes	(44,483)	(41,838)	(14,138)
Provision for (benefit from) income taxes	376	(87)	23
Net loss	$ (44,859)	$ (41,751)	$ (14,161)
Weighted-average common stock outstanding:
Basic and diluted	51,291	41,921	21,121
Net loss per share:
Basic and diluted	$ (0.87)	$ (1)	$ (0.67)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (44,859)	$ (41,751)	$ (14,161)
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation	(70)	(236)	(40)
Unrealized loss on available-for-sale securities, net	(221)
Unrealized gain (loss) on hedge transactions, net	56	58	(17)
Total other comprehensive income (loss)	(235)	(178)	(57)
Total comprehensive loss	$ (45,094)	$ (41,929)	$ (14,218)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	IPO [Member]	Convertible Preferred Stock [Member]Series A Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]Series B Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]Series C Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]IPO [Member]Series A Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]IPO [Member]Series B Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]IPO [Member]Series C Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member]IPO [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]IPO [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2012	$ 1,986		$ 1,466	$ 16,355	$ 49,872						$ 3,439		$ (1)	$ (69,082)	$ (63)
Beginning Balance, Shares at Dec. 31, 2012			5,378	8,251	5,618				20,303
Issuance of common stock	1,745										1,744		$ 1
Issuance of common stock, Shares									1,810
Vesting of common stock subject to repurchase	478										478
Stock-based compensation	3,746										3,746
Foreign currency translation	(40)														(40)
Unrealized gain on hedge transactions, net	(17)														(17)
Net loss	(14,161)													(14,161)
Ending Balance at Dec. 31, 2013	(6,263)		$ 1,466	$ 16,355	$ 49,872						9,407			(83,243)	(120)
Ending Balance, Shares at Dec. 31, 2013			5,378	8,251	5,618				22,113
Issuance of common stock upon exercise of stock options	3,285										3,285
Issuance of common stock upon exercise of stock options, Shares									1,559
Issuance of common stock		$ 121,809										$ 121,809
Issuance of common stock, Shares										7,015
Vesting of common stock subject to repurchase	782										782
Conversion of convertible preferred stock into common stock						$ (1,466)	$ (16,355)	$ (49,872)				67,693
Conversion of convertible preferred stock into common stock, Shares						(5,378)	(8,251)	(5,618)		19,246
Conversion of convertible debt into common stock		$ 2,996										$ 2,996
Conversion of convertible debt into common stock, Shares										158
Issuance of common stock upon RSU release, net of shares withheld for taxes	(1,482)										(1,482)
Issuance of common stock upon RSU release, net of shares withheld for taxes, Shares									281
Stock-based compensation	21,603										21,603
Foreign currency translation	(236)														(236)
Unrealized gain on hedge transactions, net	58														58
Net loss	(41,751)													(41,751)
Ending Balance at Dec. 31, 2014	100,801										226,093			(124,994)	(298)
Ending Balance, Shares at Dec. 31, 2014									50,372
Issuance of common stock upon exercise of stock options	$ 3,037										3,037
Issuance of common stock upon exercise of stock options, Shares	1,309								1,309
Vesting of common stock subject to repurchase	$ 274										274
Issuance of common stock upon RSU release, net of shares withheld for taxes	(5,097)										(5,097)
Issuance of common stock upon RSU release, net of shares withheld for taxes, Shares									876
Stock-based compensation	24,214										24,214
Foreign currency translation	(70)														(70)
Unrealized gain on hedge transactions, net	56														56
Unrealized gain on available-for-sale securities, net	(221)														(221)
Net loss	(44,859)													(44,859)
Ending Balance at Dec. 31, 2015	$ 78,135										$ 248,521			$ (169,853)	$ (533)
Ending Balance, Shares at Dec. 31, 2015									52,557

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net loss	$ (44,859)	$ (41,751)	$ (14,161)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,342	7,198	3,766
Stock-based compensation expense	22,558	20,382	3,625
Other	1,671	1,278	826
Changes in operating assets and liabilities:
Accounts receivable	(16,643)	(15,885)	(9,668)
Prepaid expenses and other current assets	(943)	(2,055)	(720)
Other assets	(34)	16	(383)
Accounts payable	812	249	339
Accrued expenses	785	2,292	1,886
Accrued compensation and benefits	2,581	3,554	1,387
Deferred revenue	9,163	11,566	19,995
Other liabilities	(745)	290	(225)
Net cash provided by (used in) operating activities	(14,312)	(12,866)	6,667
Investing Activities
Purchases of available-for-sale securities	(80,383)
Sales and maturities of available-for-sale securities	8,472
Additions to property and equipment	(9,629)	(12,431)	(7,331)
Proceeds from the sale of net assets			3
Net cash used in investing activities	(81,540)	(12,431)	(7,328)
Financing Activities
Proceeds from issuance of common stock	3,037	3,285	2,797
Proceeds from initial public offering, net of underwriting discounts and commissions		123,955
Payment of offering costs		(1,873)	(273)
Taxes paid related to net share settlement of equity awards	(5,097)	(1,482)
Issuance of notes payable			2,500
Payment of debt issuance costs	(113)
Principal payments on capital lease obligations	(509)	(496)	(116)
Net cash provided by (used in) financing activities	(2,682)	123,389	4,908
Effect of exchange rate changes on cash and cash equivalents	(1,260)	(1,186)	(25)
Net increase (decrease) in cash and cash equivalents	(99,794)	96,906	4,222
Cash and cash equivalents, beginning of period	125,725	28,819	24,597
Cash and cash equivalents, end of period	25,931	125,725	28,819
Supplemental cash flow information
Cash paid for income taxes, net of tax refunds	302	7	9
Cash paid for interest	44	66	21
Supplemental disclosure of non-cash investing and financing activities
Assets acquired under capital leases		263	1,432
Accrued property and equipment purchases	276	235	247
Capitalized stock-based compensation	1,656	1,221	121
Vesting of common stock subject to repurchase	$ 274	782	478
Accrued deferred offering costs			$ 539
Conversion of convertible preferred stock into common stock		67,693
Conversion of convertible debt into common stock		$ 2,996

Company Overview

Company Overview	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Company Overview	1. Company Overview Opower, Inc. (“Opower” or “the Company”) is a cloud-based software provider to the utility industry. Utilities use the Company’s software platform to deliver key client-facing applications that reduce energy demand and provide customer care. The Company’s software analyzes energy data and presents personalized insights to consumers in order to motivate reductions in energy consumption. In April 2014, the Company closed its initial public offering of its common stock (the “IPO”) whereby 7,015,000 shares of common stock were sold to the public, including 915,000 shares sold pursuant to the underwriters’ option to purchase additional shares, at a price of $19.00 per share. The Company’s shares are traded on the New York Stock Exchange under the symbol “OPWR”. The Company received aggregate proceeds of $121.8 million from the IPO, net of underwriters’ discounts and commissions and offering expenses of $2.1 million.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The consolidated financial statements include the accounts of Opower and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to current period presentation. Reclassifications and Adjustments During the first quarter of 2014, the Company recorded adjustments related to prior periods which increased revenue by $0.3 million for the year ended December 31, 2014, and increased gains on foreign currency by $0.2 million for the year ended December 31, 2014. The Company has concluded that these changes do not have a material effect on the reported results of operations for the year ended December 31, 2014 after consideration of quantitative and qualitative factors. The impact to all prior interim and annual periods was also not material. During the first quarter of 2015, the Company separated revenue into subscription revenue and services revenue and cost of revenue into cost of revenue—subscription and cost of revenue—services. As a result, revenue and cost of revenue for the years ended December 31, 2014 and 2013 were separated into subscription revenue and services revenue and cost of revenue into cost of revenue—subscription and cost of revenue—services to conform to the current year’s presentation. This change had no impact on total revenue or total cost of revenue. Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes. Significant items subject to such estimates include revenue recognition, the useful lives and recoverability of property and equipment, stock-based compensation and income taxes. Actual results could differ significantly from those estimates. Cash and Cash Equivalents The Company considers cash on deposit and all highly liquid investments with original maturities of three months or less to be cash and cash equivalents. Investments Management determines the appropriate classification of investments at the time of purchase based upon management’s intent with regard to such investments. Investments are classified as available-for-sale at the time of purchase if they are available to support either current or future operations. This classification is re-evaluated at each balance sheet date. Investments not considered cash equivalents with remaining contractual maturities of one year or less from the balance sheet date are classified as short-term investments, and those with remaining contractual maturities greater than one year from the balance sheet date are classified as long-term investments as maturities have been sequenced based upon expected cash needs to support current operations. All investments are recorded at their estimated fair value, and any unrealized gains and losses are recorded in accumulated other comprehensive income (loss). Realized gains and losses on sales and maturities of investments are recognized in the consolidated statements of operations in other income (expense). The Company performs periodic evaluations to determine whether any declines in the fair value of investments below cost are other-than-temporary. The evaluation consists of qualitative and quantitative factors regarding the severity and duration of the unrealized loss, as well as the Company’s ability and intent to hold the marketable securities until a forecasted recovery occurs. The impairments are considered to be other-than-temporary if they are related to deterioration in credit risk or if it is likely that the underlying securities will be sold prior to a full recovery of their cost basis. Other-than-temporary fair value impairments are determined based on the specific identification method and are reported in other income (expense) in the consolidated statements of operations. Accounts Receivable Accounts receivable are derived from services to be delivered to utility providers and are stated at their net realizable value. The Company regularly reviews its receivables on a client-by-client basis and evaluates whether an allowance for doubtful accounts is necessary based on any known or perceived collection issues. Any balances that are eventually deemed uncollectible are written off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. Concentration of Credit Risk Financial instruments that potentially subject the Company to significant concentration of credit risk consist primarily of cash, cash equivalents, investments and accounts receivable. The Company maintains the majority of its cash, cash equivalents and investments with two financial institutions, both of which management believes to be financially sound and with minimal credit risk. The Company’s deposits periodically exceed amounts guaranteed by the Federal Deposit Insurance Corporation. To manage accounts receivable risk, the Company monitors and evaluates the credit worthiness of its clients. Collection efforts from long-established utilities have been historically successful, therefore the Company believes credit risk to be low. The following table summarizes those clients who represented at least 10% of revenue or accounts receivable for the periods presented: Revenue Accounts Receivable Year Ended December 31, December 31, 2015 2014 2013 2015 2014 Customer A 15 % 12 % 11 % 12 % 10 % Customer B 10 % 10 % 14 % 31 % * Customer C * * 13 % * 17 % * = Represented less than 10% Property and Equipment Property and equipment are stated at cost, less accumulated depreciation and amortization. Major additions or improvements that significantly add to productive capacity or extend the life of an asset are capitalized, whereas repairs and maintenance are expensed as incurred. Depreciation and amortization are calculated on a straight-line basis over the lesser of the estimated useful life of the related assets or the related capital lease term. The estimated useful lives by asset classification are as follows: Equipment 2 to 5 years Software 3 years Furniture and fixtures 7 years Leasehold improvements Lesser of remaining term or estimated useful life The cost of assets and related depreciation is removed from the related accounts on the balance sheet when assets are sold or disposed. Any related gains or losses on asset disposals are reflected in operating expenses. Software Development Costs The Company capitalizes certain software development costs, consisting primarily of personnel and related expenses for employees and third parties who devote time to their respective projects. Internal-use software costs are capitalized during the application development stage, which is when the research stage is complete and management has committed to a project to develop software that will be used for its intended purpose. Any costs incurred during subsequent efforts to significantly upgrade and enhance the functionality of the software are also capitalized. Capitalized software costs are included in property and equipment on the consolidated balance sheets. Amortization of internal-use software costs begins once the project is substantially complete and the software is ready for its intended purpose. These capitalized costs are amortized on a straight-line basis over their estimated useful life. Evaluation of Long-Lived Assets The Company evaluates the recoverability of its long-lived assets for impairment whenever events or circumstances indicate that the carrying amount of the assets may not be recoverable. Recoverability of long-lived assets is measured by comparison of the carrying amount of the asset to the future undiscounted cash flows the asset is expected to generate. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. There were no material impairments of long-lived assets during the years ended December 31, 2015 and 2014. During the year ended December 31, 2013, we recorded a non-cash asset impairment related to long-lived assets of $0.6 million classified within research and development on the consolidated statements of operations. The charge related to a capitalized internal-use software project termination. Fair Value Measurement The Company applies fair value accounting for all financial assets and liabilities that are reported at fair value in the financial statements on a recurring basis. Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The accounting guidance establishes a defined three-tier hierarchy to classify and disclose the fair value of assets and liabilities on both the date of their initial measurement as well as all subsequent periods. The hierarchy prioritizes the inputs used to measure fair value by the lowest level of input that is available and significant to the fair value measurement. The three levels are described as follows: • Level 1 • Level 2 • Level 3 The Company evaluates its financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level of classification as of each reporting period. Derivative Financial Instruments The Company has entered into derivative contracts to reduce the risk that foreign currency exchange rate fluctuations will adversely affect its cash flows and earnings. These derivative contracts are designed to be hedging instruments, meaning any changes in cash flow are expected to be completely offset by the hedging derivative due to the fact that the critical terms of the forward contracts and forecasted sales transactions are aligned. The Company’s unsettled foreign currency derivative contracts are recorded at their fair value as either assets or liabilities on the consolidated balance sheets and are marked-to-market at the end of each reporting period. Unrealized gains and losses from the cash flow hedges are recognized as part of other comprehensive income to the extent the hedge is effective. These gains and losses are recognized in the consolidated statements of operations in revenue once the forward contracts are settled and the forecasted transaction they are designed to hedge has impacted the statements of operations. Any portions of the hedging arrangement deemed to be ineffective are recognized in the consolidated statements of operations immediately. In March 2013, the Company entered into a convertible debt agreement that contained certain conversion features and a change in control premium that were deemed to represent derivative financial instruments valued collectively. The fair value of the derivative was measured at inception and recorded as a non-current liability on the consolidated balance sheet. This derivative financial instrument was re-measured and marked-to-market at the end of each reporting period, and changes in fair value from period to period were recognized within other income (expense), net on the statements of operations. Upon the closing of the IPO, the Company’s convertible debt automatically converted into common stock. Revenue Recognition The Company derives its revenue from contractual agreements with utilities through subscriptions and services, which include analyzing data provided by the utilities and using that data to encourage utility customers to reduce energy consumption or improve satisfaction or both. The Company generates its revenue from subscriptions to its cloud-based data analytics platform and services to its clients. Subscription fees primarily pay for the ongoing integration of utility data into our software platform and the analysis and presentation of this data to energy consumers. The Company provides two main subscription service deliverables: (i) data analytics services and (ii) web platform services. Revenue for subscription fees is generally recognized ratably over the contract term beginning on the date the service is available to the client, which typically coincides with website launch or first reports delivered to households. Subscription contracts typically have a term of one to six years. Our subscription contracts do not provide the right to take possession of the supporting software and grant limited access to our platform. Therefore, our arrangements are accounted for as service contracts. Service fees cover specific services performed for our utility clients, which may include program enablement services, research, program customizations and training, custom development on top of the Company’s software platform, as well as services provided by third party providers for which the Company is the principal in the arrangement with the client. Program enablement services, which tend not to provide stand-alone value, are deferred and recognized ratably over the expected customer relationship period, which is generally the greater of four years or the contract period. Services revenues are generally recognized over the term of the contract, or on a completed contract basis for deliverables that are determined to be separate units of accounting. The Company has assessed its revenue arrangements to determine when multiple deliverables exist and if separate accounting is required for those deliverables. Revenue for subscription-based service and service contracts is segregated into separate accounting units and recognized ratably over the related service period for each accounting unit and on a completed contract basis for certain services deliverables such as program customizations. The Company recognizes revenues when the following criteria have been met: • Persuasive evidence of an arrangement exists • Delivery has occurred • The price is fixed or determinable • Collection is reasonably assured Revenue recognition for subscription service contracts corresponds directly with the service period. The revenue recognition start date begins when delivery has commenced. The commencement of delivery is generally upon the delivery of the first program report or access to web services is available for the end-user. Revenue recognition for service contracts is generally recognized over the term of the contract, or on a completed contract basis for deliverables that are determined to be separate units of accounting. Service may last from one to six years and contracts typically include the ability to terminate for breach of contract, convenience, insolvency or regulatory changes. Annual license fees, which are usually collected in advance of program launch, and data management fees, which are typically billed quarterly in advance, are both non-refundable. The Company uses the best estimate of selling price (“BESP”) to determine the relative selling prices for the purpose of allocating consideration received for each contract for accounting purposes. The BESP is determined by a historical analysis of selling prices for similar services provided by the Company. The prices are reviewed quarterly to ensure the accuracy of the estimated value on new or modified contracts. The Company charges program enablement fees to clients at the initiation of new contracts. The program enablement fees are deferred and recognized ratably over the expected customer relationship period or the contract length if greater. The corresponding program enablement costs are expensed in the periods in which they are incurred. For contracts that include variable revenue amounts, the related portion of variable revenue is deferred until the related services are provided to the client and the Company is reasonably assured that the amounts due are collectible. In addition, the Company enters into certain contracts that contain performance guarantees or service-level requirements. For contracts with performance guarantees or service-level requirements, the related portion of revenue that may be refunded to the client is not recognized until the performance criteria are met or the client’s right to refunds or credits lapses. Deferred Revenue Deferred revenue consists of nonrefundable amounts billed to or amounts collected from clients for which the related revenue has not yet been recognized due to one or more of the aforementioned revenue recognition criteria having not been met. Deferred revenue to be recognized in the succeeding twelve month period is classified as current deferred revenue and the remaining amounts are classified as non-current deferred revenue. Cost of Revenue Cost of revenue for subscriptions generally consists of information services necessary to perform data analysis, the costs of data center capacity, employee-related expenses, including salaries, benefits and stock-based compensation related to operating and servicing our internal applications, channel delivery fees, including printing and mailing for delivery of reports to utility customers, and amortization of internally capitalized software that delivers our services. In addition, we allocate a portion of overhead costs, including rent, information technology and employee benefit costs, to cost of revenue. Cost of revenue for services primarily consists of personnel costs, including salaries, benefits and stock-based compensation, allocated overhead, and third-party costs. Advertising Costs Advertising costs are expensed as incurred and relate to promotional materials for clients and general brand exposure. These costs amounted to $2.0 million, $1.9 million, and $0.5 million for the years ended December 31, 2015, 2014 and 2013, respectively. Research and Development Costs Research and development focuses on developing improved data analysis tools, increased effectiveness of communicating information to energy consumers and enhanced website portals for integration with client websites. Research and development expenses consist primarily of personnel and related expenses and the cost of third party service providers. These costs are expensed as incurred except for software development costs qualifying for capitalization. Leases The Company leases all of its office space and enters into various other operating lease agreements in conducting its business. At the inception of each lease, the Company evaluates the lease agreement to determine whether the lease is an operating or capital lease. Operating lease expenses are recognized in the statements of operations on a straight-line basis over the term of the related lease. Some of the Company’s lease agreements may contain renewal options, tenant improvement allowances, rent holidays or rent escalation clauses. When such items are included in a lease agreement, the Company records a deferred rent asset or liability on the consolidated balance sheets equal to the difference between the rent expense and cash rent payments. The cost of property and equipment acquired under capital lease arrangements represents the lesser of the present value of the minimum lease payments or the fair value of the leased asset as of the inception of the lease. Stock-Based Compensation The Company applies the fair value method to recognize compensation expense for stock-based awards. Using this method, the estimated grant-date fair value of the award is recognized on a straight-line basis over the requisite service period based on the portion of the award that is expected to vest. For non-employee awards, the Company adjusts any unvested portions of the award to fair value at each reporting date. The Company estimates forfeitures at the time of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Stock-based compensation cost for restricted stock units is measured based on the fair value of the Company’s common stock on the grant date. For awards with a performance-based vesting condition, the Company accrues stock-based compensation cost if it is probable that the performance condition will be achieved. The Company utilizes the Black-Scholes option pricing model to estimate the grant-date fair value of option awards. The exercise price of option awards is set to equal the estimated fair value of the common stock at the date of the grant. In the case of a ten percent or more shareholder, the exercise price of an incentive stock option award is set to equal 110% of the estimated fair value of the common stock at the date of grant. The following weighted-average assumptions are also used to calculate the estimated fair value of option awards: • Expected volatility • Expected term • Dividend yield • Risk-free interest rate Foreign Currency The Company’s operations located outside of the United States where the local currency is the functional currency are translated into U.S. dollars using the current rate method. Results of operations are translated at the average rate of exchange for the period. Assets and liabilities are translated at the closing rates on the period end date. Gains and losses on translation of these accounts are accumulated and reported as a separate component of equity and other comprehensive income (loss). Gains and losses on foreign currency transactions are recognized in the consolidated statements of operations as a component of other income (expense). Income Taxes The Company uses the asset and liability approach for the recognition of deferred tax assets and liabilities for the expected future tax consequences attributable to differences between the carrying amounts of assets and liabilities for financial reporting purposes and their respective tax bases, including net operating loss carryforwards. Deferred tax assets and liabilities are measured using enacted statutory tax rates applicable to the future years in which the deferred amounts are expected to be settled or realized. A valuation allowance is recorded against deferred tax assets when it is more likely than not that a tax benefit will not be realized. In determining whether a valuation allowance is necessary, the Company takes into account factors such as earnings history, expected future earnings, carryback and carryforward periods and tax planning strategies that could potentially enhance the likelihood of deferred tax asset utilization. Tax positions for the Company and its subsidiaries are subject to income tax audits by multiple tax jurisdictions throughout the world. Income tax positions are assessed based upon management’s evaluation of the facts, circumstances and information available at the reporting date, and the Company recognizes the tax benefit if it is more likely than not that the position is sustainable upon examination by the taxing authority based on the technical merits of the issue. The tax benefit recognized is measured as the largest amount of benefit which is greater than 50 percent likely to be realized upon settlement with the taxing authority. The Company recognizes interest and penalties related to income tax matters in its provision for income taxes. The effect of tax rate changes is recognized in the tax provision within the period the rate changes are enacted. The Company considers unremitted earnings of foreign subsidiaries to be invested indefinitely. No U.S. income taxes or foreign withholding taxes are provided on such permanently reinvested earnings. Deferred income tax liabilities will be recognized, net of any foreign tax credits, on any foreign subsidiary earnings that are determined to no longer be indefinitely invested. The Company has not estimated the deferred tax liabilities associated with the permanently reinvested earnings as it is impractical to do so. Comprehensive Loss Comprehensive loss consists of two components, net loss and other comprehensive income (loss). Other comprehensive income (loss) refers to gains and losses that are recorded as a separate element of stockholders’ equity and are excluded from net loss. The Company’s other comprehensive loss is comprised of foreign currency translation adjustments, unrealized gains or losses on available-for-sale securities and unrealized gains or losses on hedge transactions. Net Income (Loss) per Share The Company’s basic net income (loss) per share attributable to common stockholders is calculated by dividing the net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period. The weighted-average common shares outstanding is adjusted for shares subject to repurchase such as unvested restricted stock and unvested stock options that have been early exercised. The Company’s diluted net income (loss) per share is calculated by giving effect to all potentially dilutive common stock equivalents when determining the weighted-average number of common shares outstanding. For purposes of the dilutive net income (loss) per share calculation, convertible preferred stock, convertible notes payable, options to purchase common stock, unvested restricted stock and restricted stock units are considered to be common stock equivalents. The Company previously issued securities other than common stock that participate in dividends (“participating securities”), and therefore utilizes the two-class method to calculate net income (loss) per share. The Company considered all series of convertible preferred stock to be participating securities, as the holders of the preferred stock were entitled to receive a non-cumulative dividend on a pari-passu basis in the event that a dividend is paid on common stock. Upon the closing of the IPO, all shares of the Company’s outstanding convertible preferred stock automatically converted into shares of common stock. The Company also considers unvested restricted common stock and the shares issued upon the early exercise of stock options that are subject to repurchase to be participating securities, because holders of such shares have dividend rights in the event a dividend is paid on common stock. The holders of all series of convertible preferred stock, prior to their conversion upon the closing of the IPO, and the holders of early exercised shares subject to repurchase do not have a contractual obligation to share in the losses of the Company. The two-class method requires a portion of net income to be allocated to the participating securities to determine the net income attributable to common stockholders. Net income attributable to the common stockholders is equal to the net income less assumed periodic preferred stock dividends with any remaining earnings, after deducting assumed dividends, to be allocated on a pro rata basis between the outstanding common and preferred stock as of the end of each period. Operating Segment Operating segments are defined as components of a business that can earn revenue and incur expenses for which discrete financial information is available that is evaluated on a regular basis by the chief operating decision maker (“CODM”) to decide how to allocate resources and assess performance. The Company’s CODM, the Chief Executive Officer, reviews consolidated results of operations to make decisions, therefore the Company views its operations and manages its business as one operating segment. Recently Issued Accounting Standards In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360) In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs Interest—Imputation of Interest: Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements In April 2015, the FASB issued ASU 2015-05, Intangibles—Goodwill and Other-Internal-Use Software Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes, In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities In February 2016, the FASB issued ASU No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) Leases (Topic 840)

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements The following table summarizes the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2015 and December 31, 2014 (in thousands): December 31, 2015 December 31, 2014 Fair Value Level 1 Level 2 (2) Level 3 Fair Value Level 1 Level 2 Level 3 Assets: Cash equivalents (1) Money market funds $ 18,947 $ 18,947 $ — $ — $ 108,274 $ 108,274 $ — $ — Total cash equivalents $ 18,947 $ 18,947 $ — $ — $ 108,274 $ 108,274 $ — $ — Short-term investments: Commercial paper $ 6,245 $ — $ 6,245 $ — $ — $ — $ — $ — Corporate notes and bonds 27,093 — 27,093 — — — — — Certificates of deposit 1,679 — 1,679 — — — — — Total short-term investments $ 35,017 $ — $ 35,017 $ — $ — $ — $ — $ — Long-term investments: Corporate notes and bonds $ 28,581 $ — $ 28,581 $ — $ — $ — $ — $ — Certificates of deposit 959 — 959 — — — — — U.S. government and agency 6,924 — 6,924 — — — — — Total long-term investments $ 36,464 $ — $ 36,464 $ — $ — $ — $ — $ — Total $ 90,428 $ 18,947 $ 71,481 $ — $ 108,274 $ 108,274 $ — $ — (1) Includes money market funds associated with the Company’s overnight investment sweep account and investments in available-for-sale securities with contractual maturities of three months or less (2) All Level 2 instruments are valued using quoted prices for similar instruments

Cash Equivalents and Investment

Cash Equivalents and Investments	12 Months Ended
	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Cash Equivalents and Investments	4. Cash Equivalents and Investments The following table summarizes the Company’s unrealized gains and losses and estimated fair value of cash equivalents and investments in available-for-sale securities recorded in the consolidated balance sheets (in thousands): December 31, 2015 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds (1) $ 18,947 $ — $ — $ 18,947 Total cash equivalents $ 18,947 $ — $ — $ 18,947 Investments (2) Commercial paper $ 6,246 $ — $ (1 ) $ 6,245 Corporate notes and bonds 55,861 — (187 ) 55,674 Certificates of deposit 2,640 — (2 ) 2,638 U.S. government and agency 6,955 — (31 ) 6,924 Total investments $ 71,702 $ — $ (221 ) $ 71,481 Total cash equivalents and investments $ 90,649 $ — $ (221 ) $ 90,428 (1) Includes money market funds associated with the Company’s overnight investment sweep account and investments in available-for-sale securities with contractual maturities of three months or less (2) Includes short-term and long-term investments in available-for-sale securities December 31, 2014 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds (1) $ 108,274 $ — $ — $ 108,274 Total cash equivalents $ 108,274 $ — $ — $ 108,274 (1) Includes money market funds associated with the Company’s overnight investment sweep account Unrealized losses related to investments were primarily a result of interest rate fluctuations, and none of the investments held as of December 31, 2015 have been in a continuous unrealized loss position for greater than one year. As of December 31, 2015, the Company did not consider any of its available-for-sale investments to be other-than-temporarily impaired. The estimated fair value of the Company’s cash equivalents and investments in available-for-sale securities as of December 31, 2015, aggregated by investment category and classified by contractual maturity date, is as follows (in thousands): Less Than 1 Year or Total Money market funds $ 18,947 $ — $ 18,947 Commercial paper 6,245 — 6,245 Corporate notes and bonds 27,093 28,581 55,674 Certificates of deposit 1,679 959 2,638 U.S. government and agency — 6,924 6,924 Total $ 53,964 $ 36,464 $ 90,428

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	5. Property and Equipment The following table provides further detail on property and equipment (in thousands): December 31, December 31, Equipment $ 9,204 $ 7,748 Software 26,685 19,574 Furniture and fixtures 383 337 Leasehold improvements 2,921 2,594 Total property and equipment $ 39,193 $ 30,253 Accumulated depreciation and amortization (21,314 ) (12,581 ) Total property and equipment, net $ 17,879 $ 17,672 As of December 31, 2015 and December 31, 2014, the gross carrying amount of property and equipment includes computer equipment under capital leases with a cost basis of $1.7 million. Accumulated depreciation related to this computer equipment was $1.2 million and $0.7 million as of December 31, 2015 and December 31, 2014, respectively. Interest expense for the years ended December 31, 2015 and December 31, 2014 was immaterial. As of December 31, 2015 and December 31, 2014, the total capital lease obligation was $0.5 million and $1.0 million, respectively, was recorded on the consolidated balance sheets as components of other current liabilities and other liabilities. Capitalized internal-use software costs are also included in property and equipment. During the years ended December 31, 2015 and 2014, the Company capitalized $9.5 million and $9.9 million of these software development costs, respectively. The net book value of capitalized internal use software was $12.9 million and $11.6 million as of December 31, 2015 and 2014, respectively. Amortization expense related to capitalized internal-use software was $8.2 million, $4.6 million and $2.2 million for the years ended December 31, 2015, 2014, and 2013, respectively. The following table represents a detailed breakout of depreciation and amortization expense as recorded in the consolidated statements of operations (in thousands): Year Ended December 31, 2015 2014 2013 Subscription $ 4,938 $ 2,858 $ 1,340 Services 275 220 152 Sales and marketing 455 420 314 Research and development 5,471 3,383 1,752 General and administrative 203 317 208 Total $ 11,342 $ 7,198 $ 3,766

Debt

Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Debt	6. Debt Line of Credit—Silicon Valley Bank In June 2015, the Company renewed its revolving line of credit, originally entered in November 2010, with Silicon Valley Bank (“SVB”) for three years, maturing June 2018, and increased the availability to $30.0 million. The borrowing capacity under the revolving line of credit may be limited if certain financial ratios are not maintained. In the event these financial ratios fall below specified levels, the borrowing capacity at that time may not exceed 80% of eligible accounts receivable. Amounts drawn under the revolving line will accrue interest at either the prime rate or the LIBOR plus 250 basis points, at the Company’s election for each draw. Any amounts borrowed are collateralized by substantially all of the Company’s assets. The agreement contains customary financial covenants and other affirmative and negative covenants. The agreement also includes a financial covenant requiring the Company to maintain a minimum Adjusted EBITDA. As of December 31, 2015, the Company had no balance outstanding under this agreement, was in compliance with all financial and non-financial covenants and had full borrowing capacity available.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies Operating and Capital Leases The Company leases domestic office space in Arlington, Virginia and San Francisco, California, as well as international office space in Japan, Singapore, Ukraine and the United Kingdom. All leases are non-cancelable operating lease agreements that expire at various dates through 2018 and include renewal options. In June 2013, the Company entered into a master lease agreement with a financing company. The agreement allows for the Company to lease eligible equipment purchases. Each lease has a 36 month term, payable in equal monthly installments with the exception of the first and final payments which are prorated based on a midmonth convention. The Company has accounted for the leases under the master lease agreement as capital leases. The weighted-average interest rate implicit in the leases was 5.5%. A summary of lease commitments as of December 31, 2015 is as follows (in thousands): Year ending December 31, Operating Capital 2016 $ 5,663 $ 449 2017 2,804 63 2018 470 — 8,937 512 Less: Amounts representing interest — 15 Total lease obligations $ 8,937 $ 497 Rent expense under operating leases was $5.5 million, $4.4 million, and $3.0 million for the years ended December 31, 2015, 2014 and 2013, respectively. Letters of Credit As of December 31, 2015 and 2014, the Company had outstanding letters of credit totaling $1.3 million in connection with securing its leased office space. The outstanding amounts for Arlington and San Francisco are $0.6 million and $0.7 million, respectively, and both letters of credit remain outstanding as of December 31, 2015. Contingencies and Indemnifications In the ordinary course of business, the Company enters into contracts and agreements that may contain representations and warranties and provide for general indemnifications. The Company’s exposure under these agreements is unknown because it involves claims that may be made in the future, but have not yet been made. The Company has not paid any claims or been required to defend any actions related to indemnification obligations. However, the Company could incur costs in the future as a result of indemnification obligations. In accordance with its bylaws, the Company has indemnification obligations to its officers, directors, employees and agents (other than directors and officers) for certain events or occurrences, subject to certain limits, while they are serving at the Company’s request in such capacity. There have been no claims, and the Company has a director and officer insurance policy that enables it to recover a portion of any future claims. In the ordinary course of business, the Company is subject to legal proceedings and claims related to intellectual property, employment, vendors or other business partners. The Company has accrued for estimated losses in the accompanying condensed consolidated financial statements for matters with respect to which it believes the likelihood of an adverse outcome is probable and the amount of the loss is reasonably estimable. Although the outcome of these matters cannot be predicted with certainty, the Company does not believe that the resolution of these matters will have a material adverse effect on the consolidated financial position, future results of operations or cash flows.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Stockholders' Equity	8. Stockholders’ Equity The Company had two classes of stock authorized as of December 31, 2015 and 2014, preferred stock and common stock. Convertible Preferred Stock The Company was authorized to issue 19.4 million shares of convertible preferred stock, for which an equivalent amount of common shares were reserved for conversion. As of December 31, 2013, there were 19.2 million shares of Series A preferred stock (“Series A”), Series B preferred stock (“Series B”) and Series C preferred stock (“Series C”) that remained issued and outstanding. Upon the closing of the IPO, all shares of the Company’s outstanding convertible preferred stock automatically converted into 19.2 million shares of common stock. Undesignated Preferred Stock The Company is authorized to issue 25.0 million shares of preferred stock. As of December 31, 2015 and December 31, 2014, there were no preferred shares issued and outstanding. Common Stock The Company is authorized to issue 500.0 million shares of common stock. Common stock is issued from the pool of authorized stock upon the exercise of stock options or vesting of restricted stock. The Company is authorized to grant the right to purchase common stock subject to specific conditions and restrictions, otherwise referred to as “restricted stock”. During 2014, the total outstanding balance of restricted stock of 0.1 million vested at a weighted-average grant date fair value of $2.09. No new restricted stock was issued for the year ended December 31, 2015. There is no outstanding restricted stock balance as of December 31, 2015. Accumulated Other Comprehensive Income (Loss) Other comprehensive loss is comprised of certain gains and losses that are excluded from net income under GAAP and instead recorded as a separate element of stockholders’ equity. The Company’s other comprehensive income (loss) consists of foreign currency translation adjustments resulting from the translation of the Company’s foreign subsidiaries whose functional currency is their respective local currency, as well as any unrealized gains or losses on the Company’s foreign currency derivative contracts and investments in available-for-sale securities. The following table summarizes the activity for each component of accumulated other comprehensive loss (in thousands): Foreign Foreign Unrealized Gain Accumulated Balance as of December 31, 2012 $ 34 $ (97 ) $ — $ (63 ) Other comprehensive income (loss) before reclassifications (40 ) (28 ) — (68 ) Reclassifications to net income — 11 — 11 Other comprehensive income (loss) (40 ) (17 ) — (57 ) Balance as of December 31, 2013 $ (6 ) $ (114 ) $ — $ (120 ) Other comprehensive income (loss) before reclassifications (236 ) (18 ) — (254 ) Reclassifications to net income — 76 — 76 Other comprehensive income (loss) (236 ) 58 — (178 ) Balance as of December 31, 2014 $ (242 ) $ (56 ) $ — $ (298 ) Other comprehensive income (loss) before reclassifications (70 ) — (221 ) (291 ) Reclassifications to net income — 56 — 56 Other comprehensive income (loss) (70 ) 56 (221 ) (235 ) Balance as of December 31, 2015 $ (312 ) $ — $ (221 ) $ (533 ) Gains (losses) on cash flow hedges are recognized in the consolidated statements of operations in revenue.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	9. Stock-Based Compensation Stock Plan On August 1, 2007, the Company adopted the 2007 Stock Plan under which eligible employees, officers, directors and consultants of the Company may be granted incentive or non-qualified stock options and restricted stock units (“RSUs”). Upon closing of the IPO, the Company adopted the 2014 Stock Incentive Plan (the “2014 Plan”) which replaced the 2007 Stock Plan. The 2014 Plan allows the compensation committee to make equity-based incentive awards to our officers, employees, directors, and other key persons, including consultants. Employee equity awards generally vest over a four year period and have graded vesting schedules. The vesting terms for non-employee equity awards vary for each individual that is providing services to the Company. RSUs and stock options generally expire seven and ten years from the date of grant, respectively. As of December 31, 2015, the total shares of common stock reserved for issuance was 25.0 million, 4.8 million of which were available for issuance. Stock Option Activity Stock option activity is summarized in the following table (in thousands, except per share amounts): Options Weighted- Weighted-Average Aggregate (1) Balance at December 31, 2014 5,815 $ 4.40 7.3 $ 57,715 Exercised (1,309 ) 2.32 Forfeited (573 ) 7.03 Balance at December 31, 2015 3,933 $ 4.71 6.1 $ 24,158 Vested and expected to vest after December 31, 2015 3,883 $ 4.67 6.1 $ 23,912 Exercisable at December 31, 2015 3,478 $ 4.35 6.1 $ 22,198 (1) Aggregate intrinsic value represents the difference between the estimated fair value of the underlying common stock and the exercise price of outstanding, in-the-money options. The 2007 Stock Plan allows for grants of immediately exercisable stock options. The Company has the right to purchase any unvested, but issued common shares at the original exercise price during the repurchase period following an employee’s termination. The consideration received for an exercise of an unvested option is considered to be a deposit of the exercise price. The related dollar amount is recorded as other current liabilities and other liabilities on the Company’s consolidated balance sheets and will be reclassified to equity as the Company’s repurchase right lapses. As of December 31, 2015 and December 31, 2014, unvested stock options subject to repurchase were 0.0 million and 0.2 million, respectively, at an aggregate exercise price of $0.1 million and $0.4 million, respectively. The following table summarizes additional information on stock option grants, vesting and exercises (in thousands): Year Ended December 31, 2015 2014 2013 Total fair value of stock options granted $ — $ 435 $ 20,919 Total fair value of shares vested 4,668 6,238 2,427 Total intrinsic value of stock options exercised 11,317 23,420 8,258 Cash received from stock options exercised 3,037 3,285 2,797 The Company applied the following weighted-average assumptions to estimate the fair value of employee stock options using the Black-Scholes option pricing model: Year Ended 2014 2013 Expected volatility 48 % 51 % Expected term (in years) 6.0 6.0 Dividend yield 0 % 0 % Risk-free interest rate 2 % 1 % Restricted Stock Unit Activity A summary of restricted stock unit (“RSU”) activity for the year ended December 31, 2015 is summarized in the following table (in thousands, except per share amounts): RSUs Weighted- Weighted-Average Aggregate Intrinsic Balance at December 31, 2014 2,838 $ 16.77 6.4 $ 40,391 Granted 4,645 10.55 Released (1,332 ) 15.42 Forfeited (987 ) 14.71 Balance at December 31, 2015 5,164 $ 11.92 6.3 $ 54,535 Vested and expected to vest after December 31, 2015 4,275 $ 11.92 6.3 $ 45,149 Stock-Based Compensation Expense Stock-based compensation expense is included in the consolidated statements of operations within the following line items (in thousands): Year Ended December 31, 2015 2014 2013 Subscription $ 838 $ 327 $ 40 Services 1,412 1,027 164 Sales and marketing 9,178 8,932 1,487 Research and development 7,418 5,623 960 General and administrative 3,712 4,473 974 Total $ 22,558 $ 20,382 $ 3,625 Unrecognized Stock-Based Compensation A summary of our remaining unrecognized compensation expense, net of estimated forfeitures, and the weighted average remaining amortization period at December 31, 2015 related to our non-vested stock options and RSU awards is presented below (in thousands): As of December 31, 2015 Unrecognized Weighted-Average Restricted stock units $ 42,828 2.5 Stock options 7,299 1.8 $ 50,127 For the years ended December 31, 2015, 2014 and 2013, total capitalized stock-based compensation expense was $1.7 million, $1.2 million and $0.1 million, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	10. Income Taxes For the years ended December 31, 2015, 2014 and 2013 the income tax provision for continuing operations is composed of state tax expense and foreign tax expense for the Company’s consolidated international subsidiaries. The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax: Year Ended December 31, 2015 2014 2013 U.S. federal income tax rate 34 % 34 % 34 % State taxes 5 % 5 % 4 % Change in valuation allowance (35 %) (36 %) (31 %) Change in state rate 1 % (1 %) 4 % Stock compensation (5 %) (1 %) (4 %) Other (1 %) (1 %) (7 %) Effective tax rate (1 %) 0 % 0 % As a result of prospective application of Accounting Standards Update No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes Temporary differences between the carrying amounts of assets and liabilities used for financial reporting purposes versus those used for income tax purposes are reflected in deferred income taxes. The components of the Company’s deferred tax assets and liabilities, as well as the related valuation allowance as of December 31, 2015 and 2014, are as follows (in thousands): December 31, 2015 2014 Deferred tax assets Accrued compensation and benefits $ 2,317 $ 2,058 Deferred rent liability 107 305 Stock compensation 5,931 5,440 Deferred income 1,220 1,043 Net operating loss carryforward 49,504 34,414 Other 116 37 Total deferred tax assets 59,195 43,297 Valuation allowance (55,100 ) (39,652 ) Net deferred tax asset 4,095 3,645 Deferred tax liabilities Depreciation and amortization 4,106 3,649 Total deferred tax liabilities 4,106 3,649 Net deferred tax assets (liabilities) $ (11 ) $ (4 ) Opower had gross U.S. federal and state net operating loss carryforwards of approximately $133.5 million and $91.2 million as of December 31, 2015 and 2014, respectively. Approximately $9.9 million of the net operating loss carryforwards have not been recognized as they relate to benefits associated with stock option exercises that have not reduced current taxes payable. When realized, approximately $3.9 million of the U.S. federal and state net operating loss carryforwards associated with windfall tax benefits will be recognized as a benefit through additional paid in capital. The U.S. federal and state net operating loss carryforwards will begin to expire in 2027. The Company’s net operating loss carryforwards may be used to offset future taxable income and thereby reduce the Company’s U.S. Federal and state income taxes otherwise payable. Section 382 of the Internal Revenue Code of 1986, as amended, (“Section 382”) imposes an annual limit on the ability, of a corporation that undergoes an ownership change, to utilize its net operating loss carryforwards to reduce its current year income tax liability. In the event of certain changes in the Company’s stockholder base, the Company’s ability to utilize certain net operating losses to offset future taxable income in any particular year may be limited pursuant to Section 382. Based on the Company’s limited operating history and cumulative operating losses to date, management believes that it is more likely than not that the Company’s domestic deferred tax assets would not be fully realized. The Company recorded valuation allowances of $55.1 million and $39.7 million, as of December 31, 2015 and 2014 respectively. The change in valuation allowance primarily relates to the 2015 domestic pretax book losses. The Company has not provided for U.S. income and foreign withholding taxes on foreign subsidiaries’ undistributed earnings as of December 31, 2015, because such earnings have been retained and are intended to be indefinitely reinvested outside of the United States. It is not practicable to estimate the amount of taxes that would be payable upon remittance of these earnings because such tax, if any, is dependent on circumstances existing if and when remittance occurs. To date, there have been no tax benefits recognized related to uncertain tax positions. The Company does not anticipate a material change in the unrecognized tax benefits in the next twelve months. The Company files federal, state and foreign income tax returns in jurisdictions with varying statutes of limitations. Due to its net operating loss carryforwards, the Company’s income tax returns generally remain subject to examination by federal and most state tax authorities from 2008 to 2015.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	11. Net Income (Loss) Per Share The following table summarizes the calculation of the Company’s basic and diluted net income (loss) per share under the two-class method attributable to common stockholders during the years ended December 31, 2015, 2014 and 2013 (in thousands, except per share amounts): Year Ended December 31, 2015 2014 2013 Numerator: Net loss $ (44,859 ) $ (41,751 ) $ (14,161 ) Non-cumulative dividends to preferred stockholders — — — Net loss attributable to common stockholders $ (44,859 ) $ (41,751 ) $ (14,161 ) Denominator: Weighted-average common stock outstanding, basic 51,291 41,921 21,121 Effect of potentially dilutive stock options and restricted stock units — — — Weighted-average common stock outstanding, diluted 51,291 41,921 21,121 Net loss per share, basic and diluted $ (0.87 ) $ (1.00 ) $ (0.67 ) The holders of all series of convertible preferred stock did not, and the holders of early exercised shares subject to repurchase do not, have a contractual obligation to share in the losses of the Company. As such, the Company’s net losses for the years ended December 31, 2015, 2014 and 2013 were not allocated to these participating securities. Anti-Dilutive Shares Excluded The following potential shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the periods presented (in thousands): December 31, 2015 2014 2013 Convertible preferred stock — — 19,247 Stock options 3,933 5,815 7,790 Restricted stock units 5,164 2,838 1,093 Common stock subject to repurchase 31 154 408 9,128 8,807 28,538 In addition, for periods prior to the IPO, the Company has also excluded the convertible preferred stock and convertible note payable from the calculation of diluted net loss per share attributable to common stockholders because the conversion was contingent on future events.

Geographic Information

Geographic Information	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Geographic Information	12. Geographic Information For the years ended December 31, 2015, 2014 and 2013, approximately 91%, 86% and 90% of the Company’s revenue was generated by clients located in the United States, respectively. Substantially all of the Company’s long-lived assets currently reside in the United States.

Employee Benefit and Retirement

Employee Benefit and Retirement Plans	12 Months Ended
	Dec. 31, 2015
Postemployment Benefits [Abstract]
Employee Benefit and Retirement Plans	13. Employee Benefit and Retirement Plans The Company has a defined contribution 401(k) retirement and savings plan (the “401k Plan”) to provide retirement benefits for all of our eligible U.S. employees. All U.S. employees that are at least 21 years of age are eligible to participate in the 401k Plan immediately upon hiring. Under the 401k Plan, eligible employees may contribute up to 100% of either pre-tax compensation or after-tax compensation through a Roth 401(k) deferral contribution, up to the annual Internal Revenue Service dollar limit for the applicable year. To date, the Company has not made any matching contributions to this plan.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	14. Valuation and Qualifying Accounts Changes in valuation and qualifying accounts consisted of the following (in thousands): Additions Beginning Charged to Charged to Write-offs Deductions Ending 2015 Allowance for doubtful accounts $ — $ — $ (49 ) $ — $ — $ (49 ) Deferred tax valuation allowance (39,652 ) (15,448 ) — — — (55,100 ) 2014 Allowance for doubtful accounts $ (361 ) $ — $ — $ — $ 361 $ — Deferred tax valuation allowance (24,345 ) (15,307 ) — — — (39,652 ) 2013 Allowance for doubtful accounts $ — $ — $ (361 ) $ — $ — $ (361 ) Deferred tax valuation allowance (19,944 ) (4,401 ) — — — (24,345 )

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of Opower and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to current period presentation.
Reclassifications and Adjustments	Reclassifications and Adjustments During the first quarter of 2014, the Company recorded adjustments related to prior periods which increased revenue by $0.3 million for the year ended December 31, 2014, and increased gains on foreign currency by $0.2 million for the year ended December 31, 2014. The Company has concluded that these changes do not have a material effect on the reported results of operations for the year ended December 31, 2014 after consideration of quantitative and qualitative factors. The impact to all prior interim and annual periods was also not material. During the first quarter of 2015, the Company separated revenue into subscription revenue and services revenue and cost of revenue into cost of revenue—subscription and cost of revenue—services. As a result, revenue and cost of revenue for the years ended December 31, 2014 and 2013 were separated into subscription revenue and services revenue and cost of revenue into cost of revenue—subscription and cost of revenue—services to conform to the current year’s presentation. This change had no impact on total revenue or total cost of revenue.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in these consolidated financial statements and accompanying notes. Significant items subject to such estimates include revenue recognition, the useful lives and recoverability of property and equipment, stock-based compensation and income taxes. Actual results could differ significantly from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers cash on deposit and all highly liquid investments with original maturities of three months or less to be cash and cash equivalents.
Investments	Investments Management determines the appropriate classification of investments at the time of purchase based upon management’s intent with regard to such investments. Investments are classified as available-for-sale at the time of purchase if they are available to support either current or future operations. This classification is re-evaluated at each balance sheet date. Investments not considered cash equivalents with remaining contractual maturities of one year or less from the balance sheet date are classified as short-term investments, and those with remaining contractual maturities greater than one year from the balance sheet date are classified as long-term investments as maturities have been sequenced based upon expected cash needs to support current operations. All investments are recorded at their estimated fair value, and any unrealized gains and losses are recorded in accumulated other comprehensive income (loss). Realized gains and losses on sales and maturities of investments are recognized in the consolidated statements of operations in other income (expense). The Company performs periodic evaluations to determine whether any declines in the fair value of investments below cost are other-than-temporary. The evaluation consists of qualitative and quantitative factors regarding the severity and duration of the unrealized loss, as well as the Company’s ability and intent to hold the marketable securities until a forecasted recovery occurs. The impairments are considered to be other-than-temporary if they are related to deterioration in credit risk or if it is likely that the underlying securities will be sold prior to a full recovery of their cost basis. Other-than-temporary fair value impairments are determined based on the specific identification method and are reported in other income (expense) in the consolidated statements of operations.
Accounts Receivable	Accounts Receivable Accounts receivable are derived from services to be delivered to utility providers and are stated at their net realizable value. The Company regularly reviews its receivables on a client-by-client basis and evaluates whether an allowance for doubtful accounts is necessary based on any known or perceived collection issues. Any balances that are eventually deemed uncollectible are written off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to significant concentration of credit risk consist primarily of cash, cash equivalents, investments and accounts receivable. The Company maintains the majority of its cash, cash equivalents and investments with two financial institutions, both of which management believes to be financially sound and with minimal credit risk. The Company’s deposits periodically exceed amounts guaranteed by the Federal Deposit Insurance Corporation. To manage accounts receivable risk, the Company monitors and evaluates the credit worthiness of its clients. Collection efforts from long-established utilities have been historically successful, therefore the Company believes credit risk to be low. The following table summarizes those clients who represented at least 10% of revenue or accounts receivable for the periods presented: Revenue Accounts Receivable Year Ended December 31, December 31, 2015 2014 2013 2015 2014 Customer A 15 % 12 % 11 % 12 % 10 % Customer B 10 % 10 % 14 % 31 % * Customer C * * 13 % * 17 % * = Represented less than 10%
Property and Equipment	Property and Equipment Property and equipment are stated at cost, less accumulated depreciation and amortization. Major additions or improvements that significantly add to productive capacity or extend the life of an asset are capitalized, whereas repairs and maintenance are expensed as incurred. Depreciation and amortization are calculated on a straight-line basis over the lesser of the estimated useful life of the related assets or the related capital lease term. The estimated useful lives by asset classification are as follows: Equipment 2 to 5 years Software 3 years Furniture and fixtures 7 years Leasehold improvements Lesser of remaining term or estimated useful life The cost of assets and related depreciation is removed from the related accounts on the balance sheet when assets are sold or disposed. Any related gains or losses on asset disposals are reflected in operating expenses.
Software Development Costs	Software Development Costs The Company capitalizes certain software development costs, consisting primarily of personnel and related expenses for employees and third parties who devote time to their respective projects. Internal-use software costs are capitalized during the application development stage, which is when the research stage is complete and management has committed to a project to develop software that will be used for its intended purpose. Any costs incurred during subsequent efforts to significantly upgrade and enhance the functionality of the software are also capitalized. Capitalized software costs are included in property and equipment on the consolidated balance sheets. Amortization of internal-use software costs begins once the project is substantially complete and the software is ready for its intended purpose. These capitalized costs are amortized on a straight-line basis over their estimated useful life.
Evaluation of Long-Lived Assets	Evaluation of Long-Lived Assets The Company evaluates the recoverability of its long-lived assets for impairment whenever events or circumstances indicate that the carrying amount of the assets may not be recoverable. Recoverability of long-lived assets is measured by comparison of the carrying amount of the asset to the future undiscounted cash flows the asset is expected to generate. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. There were no material impairments of long-lived assets during the years ended December 31, 2015 and 2014. During the year ended December 31, 2013, we recorded a non-cash asset impairment related to long-lived assets of $0.6 million classified within research and development on the consolidated statements of operations. The charge related to a capitalized internal-use software project termination.
Fair Value Measurement	Fair Value Measurement The Company applies fair value accounting for all financial assets and liabilities that are reported at fair value in the financial statements on a recurring basis. Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The accounting guidance establishes a defined three-tier hierarchy to classify and disclose the fair value of assets and liabilities on both the date of their initial measurement as well as all subsequent periods. The hierarchy prioritizes the inputs used to measure fair value by the lowest level of input that is available and significant to the fair value measurement. The three levels are described as follows: • Level 1 • Level 2 • Level 3 The Company evaluates its financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level of classification as of each reporting period.
Derivative Financial Instruments	Derivative Financial Instruments The Company has entered into derivative contracts to reduce the risk that foreign currency exchange rate fluctuations will adversely affect its cash flows and earnings. These derivative contracts are designed to be hedging instruments, meaning any changes in cash flow are expected to be completely offset by the hedging derivative due to the fact that the critical terms of the forward contracts and forecasted sales transactions are aligned. The Company’s unsettled foreign currency derivative contracts are recorded at their fair value as either assets or liabilities on the consolidated balance sheets and are marked-to-market at the end of each reporting period. Unrealized gains and losses from the cash flow hedges are recognized as part of other comprehensive income to the extent the hedge is effective. These gains and losses are recognized in the consolidated statements of operations in revenue once the forward contracts are settled and the forecasted transaction they are designed to hedge has impacted the statements of operations. Any portions of the hedging arrangement deemed to be ineffective are recognized in the consolidated statements of operations immediately. In March 2013, the Company entered into a convertible debt agreement that contained certain conversion features and a change in control premium that were deemed to represent derivative financial instruments valued collectively. The fair value of the derivative was measured at inception and recorded as a non-current liability on the consolidated balance sheet. This derivative financial instrument was re-measured and marked-to-market at the end of each reporting period, and changes in fair value from period to period were recognized within other income (expense), net on the statements of operations. Upon the closing of the IPO, the Company’s convertible debt automatically converted into common stock.
Revenue Recognition	Revenue Recognition The Company derives its revenue from contractual agreements with utilities through subscriptions and services, which include analyzing data provided by the utilities and using that data to encourage utility customers to reduce energy consumption or improve satisfaction or both. The Company generates its revenue from subscriptions to its cloud-based data analytics platform and services to its clients. Subscription fees primarily pay for the ongoing integration of utility data into our software platform and the analysis and presentation of this data to energy consumers. The Company provides two main subscription service deliverables: (i) data analytics services and (ii) web platform services. Revenue for subscription fees is generally recognized ratably over the contract term beginning on the date the service is available to the client, which typically coincides with website launch or first reports delivered to households. Subscription contracts typically have a term of one to six years. Our subscription contracts do not provide the right to take possession of the supporting software and grant limited access to our platform. Therefore, our arrangements are accounted for as service contracts. Service fees cover specific services performed for our utility clients, which may include program enablement services, research, program customizations and training, custom development on top of the Company’s software platform, as well as services provided by third party providers for which the Company is the principal in the arrangement with the client. Program enablement services, which tend not to provide stand-alone value, are deferred and recognized ratably over the expected customer relationship period, which is generally the greater of four years or the contract period. Services revenues are generally recognized over the term of the contract, or on a completed contract basis for deliverables that are determined to be separate units of accounting. The Company has assessed its revenue arrangements to determine when multiple deliverables exist and if separate accounting is required for those deliverables. Revenue for subscription-based service and service contracts is segregated into separate accounting units and recognized ratably over the related service period for each accounting unit and on a completed contract basis for certain services deliverables such as program customizations. The Company recognizes revenues when the following criteria have been met: • Persuasive evidence of an arrangement exists • Delivery has occurred • The price is fixed or determinable • Collection is reasonably assured Revenue recognition for subscription service contracts corresponds directly with the service period. The revenue recognition start date begins when delivery has commenced. The commencement of delivery is generally upon the delivery of the first program report or access to web services is available for the end-user. Revenue recognition for service contracts is generally recognized over the term of the contract, or on a completed contract basis for deliverables that are determined to be separate units of accounting. Service may last from one to six years and contracts typically include the ability to terminate for breach of contract, convenience, insolvency or regulatory changes. Annual license fees, which are usually collected in advance of program launch, and data management fees, which are typically billed quarterly in advance, are both non-refundable. The Company uses the best estimate of selling price (“BESP”) to determine the relative selling prices for the purpose of allocating consideration received for each contract for accounting purposes. The BESP is determined by a historical analysis of selling prices for similar services provided by the Company. The prices are reviewed quarterly to ensure the accuracy of the estimated value on new or modified contracts. The Company charges program enablement fees to clients at the initiation of new contracts. The program enablement fees are deferred and recognized ratably over the expected customer relationship period or the contract length if greater. The corresponding program enablement costs are expensed in the periods in which they are incurred. For contracts that include variable revenue amounts, the related portion of variable revenue is deferred until the related services are provided to the client and the Company is reasonably assured that the amounts due are collectible. In addition, the Company enters into certain contracts that contain performance guarantees or service-level requirements. For contracts with performance guarantees or service-level requirements, the related portion of revenue that may be refunded to the client is not recognized until the performance criteria are met or the client’s right to refunds or credits lapses.
Deferred Revenue	Deferred Revenue Deferred revenue consists of nonrefundable amounts billed to or amounts collected from clients for which the related revenue has not yet been recognized due to one or more of the aforementioned revenue recognition criteria having not been met. Deferred revenue to be recognized in the succeeding twelve month period is classified as current deferred revenue and the remaining amounts are classified as non-current deferred revenue.
Cost of Revenue	Cost of Revenue Cost of revenue for subscriptions generally consists of information services necessary to perform data analysis, the costs of data center capacity, employee-related expenses, including salaries, benefits and stock-based compensation related to operating and servicing our internal applications, channel delivery fees, including printing and mailing for delivery of reports to utility customers, and amortization of internally capitalized software that delivers our services. In addition, we allocate a portion of overhead costs, including rent, information technology and employee benefit costs, to cost of revenue. Cost of revenue for services primarily consists of personnel costs, including salaries, benefits and stock-based compensation, allocated overhead, and third-party costs.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred and relate to promotional materials for clients and general brand exposure. These costs amounted to $2.0 million, $1.9 million, and $0.5 million for the years ended December 31, 2015, 2014 and 2013, respectively.
Research and Development Costs	Research and Development Costs Research and development focuses on developing improved data analysis tools, increased effectiveness of communicating information to energy consumers and enhanced website portals for integration with client websites. Research and development expenses consist primarily of personnel and related expenses and the cost of third party service providers. These costs are expensed as incurred except for software development costs qualifying for capitalization.
Leases	Leases The Company leases all of its office space and enters into various other operating lease agreements in conducting its business. At the inception of each lease, the Company evaluates the lease agreement to determine whether the lease is an operating or capital lease. Operating lease expenses are recognized in the statements of operations on a straight-line basis over the term of the related lease. Some of the Company’s lease agreements may contain renewal options, tenant improvement allowances, rent holidays or rent escalation clauses. When such items are included in a lease agreement, the Company records a deferred rent asset or liability on the consolidated balance sheets equal to the difference between the rent expense and cash rent payments. The cost of property and equipment acquired under capital lease arrangements represents the lesser of the present value of the minimum lease payments or the fair value of the leased asset as of the inception of the lease.
Stock-Based Compensation	Stock-Based Compensation The Company applies the fair value method to recognize compensation expense for stock-based awards. Using this method, the estimated grant-date fair value of the award is recognized on a straight-line basis over the requisite service period based on the portion of the award that is expected to vest. For non-employee awards, the Company adjusts any unvested portions of the award to fair value at each reporting date. The Company estimates forfeitures at the time of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Stock-based compensation cost for restricted stock units is measured based on the fair value of the Company’s common stock on the grant date. For awards with a performance-based vesting condition, the Company accrues stock-based compensation cost if it is probable that the performance condition will be achieved. The Company utilizes the Black-Scholes option pricing model to estimate the grant-date fair value of option awards. The exercise price of option awards is set to equal the estimated fair value of the common stock at the date of the grant. In the case of a ten percent or more shareholder, the exercise price of an incentive stock option award is set to equal 110% of the estimated fair value of the common stock at the date of grant. The following weighted-average assumptions are also used to calculate the estimated fair value of option awards: • Expected volatility • Expected term • Dividend yield • Risk-free interest rate
Foreign Currency	Foreign Currency The Company’s operations located outside of the United States where the local currency is the functional currency are translated into U.S. dollars using the current rate method. Results of operations are translated at the average rate of exchange for the period. Assets and liabilities are translated at the closing rates on the period end date. Gains and losses on translation of these accounts are accumulated and reported as a separate component of equity and other comprehensive income (loss). Gains and losses on foreign currency transactions are recognized in the consolidated statements of operations as a component of other income (expense).
Income Taxes	Income Taxes The Company uses the asset and liability approach for the recognition of deferred tax assets and liabilities for the expected future tax consequences attributable to differences between the carrying amounts of assets and liabilities for financial reporting purposes and their respective tax bases, including net operating loss carryforwards. Deferred tax assets and liabilities are measured using enacted statutory tax rates applicable to the future years in which the deferred amounts are expected to be settled or realized. A valuation allowance is recorded against deferred tax assets when it is more likely than not that a tax benefit will not be realized. In determining whether a valuation allowance is necessary, the Company takes into account factors such as earnings history, expected future earnings, carryback and carryforward periods and tax planning strategies that could potentially enhance the likelihood of deferred tax asset utilization. Tax positions for the Company and its subsidiaries are subject to income tax audits by multiple tax jurisdictions throughout the world. Income tax positions are assessed based upon management’s evaluation of the facts, circumstances and information available at the reporting date, and the Company recognizes the tax benefit if it is more likely than not that the position is sustainable upon examination by the taxing authority based on the technical merits of the issue. The tax benefit recognized is measured as the largest amount of benefit which is greater than 50 percent likely to be realized upon settlement with the taxing authority. The Company recognizes interest and penalties related to income tax matters in its provision for income taxes. The effect of tax rate changes is recognized in the tax provision within the period the rate changes are enacted. The Company considers unremitted earnings of foreign subsidiaries to be invested indefinitely. No U.S. income taxes or foreign withholding taxes are provided on such permanently reinvested earnings. Deferred income tax liabilities will be recognized, net of any foreign tax credits, on any foreign subsidiary earnings that are determined to no longer be indefinitely invested. The Company has not estimated the deferred tax liabilities associated with the permanently reinvested earnings as it is impractical to do so.
Comprehensive Loss	Comprehensive Loss Comprehensive loss consists of two components, net loss and other comprehensive income (loss). Other comprehensive income (loss) refers to gains and losses that are recorded as a separate element of stockholders’ equity and are excluded from net loss. The Company’s other comprehensive loss is comprised of foreign currency translation adjustments, unrealized gains or losses on available-for-sale securities and unrealized gains or losses on hedge transactions.
Net Income (Loss) per Share	Net Income (Loss) per Share The Company’s basic net income (loss) per share attributable to common stockholders is calculated by dividing the net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period. The weighted-average common shares outstanding is adjusted for shares subject to repurchase such as unvested restricted stock and unvested stock options that have been early exercised. The Company’s diluted net income (loss) per share is calculated by giving effect to all potentially dilutive common stock equivalents when determining the weighted-average number of common shares outstanding. For purposes of the dilutive net income (loss) per share calculation, convertible preferred stock, convertible notes payable, options to purchase common stock, unvested restricted stock and restricted stock units are considered to be common stock equivalents. The Company previously issued securities other than common stock that participate in dividends (“participating securities”), and therefore utilizes the two-class method to calculate net income (loss) per share. The Company considered all series of convertible preferred stock to be participating securities, as the holders of the preferred stock were entitled to receive a non-cumulative dividend on a pari-passu basis in the event that a dividend is paid on common stock. Upon the closing of the IPO, all shares of the Company’s outstanding convertible preferred stock automatically converted into shares of common stock. The Company also considers unvested restricted common stock and the shares issued upon the early exercise of stock options that are subject to repurchase to be participating securities, because holders of such shares have dividend rights in the event a dividend is paid on common stock. The holders of all series of convertible preferred stock, prior to their conversion upon the closing of the IPO, and the holders of early exercised shares subject to repurchase do not have a contractual obligation to share in the losses of the Company. The two-class method requires a portion of net income to be allocated to the participating securities to determine the net income attributable to common stockholders. Net income attributable to the common stockholders is equal to the net income less assumed periodic preferred stock dividends with any remaining earnings, after deducting assumed dividends, to be allocated on a pro rata basis between the outstanding common and preferred stock as of the end of each period.
Operating Segment	Operating Segment Operating segments are defined as components of a business that can earn revenue and incur expenses for which discrete financial information is available that is evaluated on a regular basis by the chief operating decision maker (“CODM”) to decide how to allocate resources and assess performance. The Company’s CODM, the Chief Executive Officer, reviews consolidated results of operations to make decisions, therefore the Company views its operations and manages its business as one operating segment.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360) In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs Interest—Imputation of Interest: Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements In April 2015, the FASB issued ASU 2015-05, Intangibles—Goodwill and Other-Internal-Use Software Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes, In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities In February 2016, the FASB issued ASU No. 2016-02 (“ASU 2016-02”), Leases (Topic 842) Leases (Topic 840)

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Revenue or Accounts Receivable Percentage of Major Customers	The following table summarizes those clients who represented at least 10% of revenue or accounts receivable for the periods presented: Revenue Accounts Receivable Year Ended December 31, December 31, 2015 2014 2013 2015 2014 Customer A 15 % 12 % 11 % 12 % 10 % Customer B 10 % 10 % 14 % 31 % * Customer C * * 13 % * 17 % * = Represented less than 10%
Estimated Useful Lives of Assets	The estimated useful lives by asset classification are as follows: Equipment 2 to 5 years Software 3 years Furniture and fixtures 7 years Leasehold improvements Lesser of remaining term or estimated useful life

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following table summarizes the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2015 and December 31, 2014 (in thousands): December 31, 2015 December 31, 2014 Fair Value Level 1 Level 2 (2) Level 3 Fair Value Level 1 Level 2 Level 3 Assets: Cash equivalents (1) Money market funds $ 18,947 $ 18,947 $ — $ — $ 108,274 $ 108,274 $ — $ — Total cash equivalents $ 18,947 $ 18,947 $ — $ — $ 108,274 $ 108,274 $ — $ — Short-term investments: Commercial paper $ 6,245 $ — $ 6,245 $ — $ — $ — $ — $ — Corporate notes and bonds 27,093 — 27,093 — — — — — Certificates of deposit 1,679 — 1,679 — — — — — Total short-term investments $ 35,017 $ — $ 35,017 $ — $ — $ — $ — $ — Long-term investments: Corporate notes and bonds $ 28,581 $ — $ 28,581 $ — $ — $ — $ — $ — Certificates of deposit 959 — 959 — — — — — U.S. government and agency 6,924 — 6,924 — — — — — Total long-term investments $ 36,464 $ — $ 36,464 $ — $ — $ — $ — $ — Total $ 90,428 $ 18,947 $ 71,481 $ — $ 108,274 $ 108,274 $ — $ — (1) Includes money market funds associated with the Company’s overnight investment sweep account and investments in available-for-sale securities with contractual maturities of three months or less (2) All Level 2 instruments are valued using quoted prices for similar instruments

Cash Equivalents and Investme25

Cash Equivalents and Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Cash and Cash Equivalents [Abstract]
Summary of Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Investments in Available-for-Sale Securities Recorded in Consolidated Balance Sheets	The following table summarizes the Company’s unrealized gains and losses and estimated fair value of cash equivalents and investments in available-for-sale securities recorded in the consolidated balance sheets (in thousands): December 31, 2015 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds (1) $ 18,947 $ — $ — $ 18,947 Total cash equivalents $ 18,947 $ — $ — $ 18,947 Investments (2) Commercial paper $ 6,246 $ — $ (1 ) $ 6,245 Corporate notes and bonds 55,861 — (187 ) 55,674 Certificates of deposit 2,640 — (2 ) 2,638 U.S. government and agency 6,955 — (31 ) 6,924 Total investments $ 71,702 $ — $ (221 ) $ 71,481 Total cash equivalents and investments $ 90,649 $ — $ (221 ) $ 90,428 (1) Includes money market funds associated with the Company’s overnight investment sweep account and investments in available-for-sale securities with contractual maturities of three months or less (2) Includes short-term and long-term investments in available-for-sale securities December 31, 2014 Amortized Unrealized Unrealized Estimated Cash equivalents: Money market funds (1) $ 108,274 $ — $ — $ 108,274 Total cash equivalents $ 108,274 $ — $ — $ 108,274 (1) Includes money market funds associated with the Company’s overnight investment sweep account
Estimated Fair Value of Cash Equivalents and Investments in Available-for-Sale Securities Aggregated by Investment Category and Classified by Contractual Maturity Date	The estimated fair value of the Company’s cash equivalents and investments in available-for-sale securities as of December 31, 2015, aggregated by investment category and classified by contractual maturity date, is as follows (in thousands): Less Than 1 Year or Total Money market funds $ 18,947 $ — $ 18,947 Commercial paper 6,245 — 6,245 Corporate notes and bonds 27,093 28,581 55,674 Certificates of deposit 1,679 959 2,638 U.S. government and agency — 6,924 6,924 Total $ 53,964 $ 36,464 $ 90,428

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	The following table provides further detail on property and equipment (in thousands): December 31, December 31, Equipment $ 9,204 $ 7,748 Software 26,685 19,574 Furniture and fixtures 383 337 Leasehold improvements 2,921 2,594 Total property and equipment $ 39,193 $ 30,253 Accumulated depreciation and amortization (21,314 ) (12,581 ) Total property and equipment, net $ 17,879 $ 17,672
Breakout of Depreciation and Amortization Expense	The following table represents a detailed breakout of depreciation and amortization expense as recorded in the consolidated statements of operations (in thousands): Year Ended December 31, 2015 2014 2013 Subscription $ 4,938 $ 2,858 $ 1,340 Services 275 220 152 Sales and marketing 455 420 314 Research and development 5,471 3,383 1,752 General and administrative 203 317 208 Total $ 11,342 $ 7,198 $ 3,766

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Summary of Lease Commitments	A summary of lease commitments as of December 31, 2015 is as follows (in thousands): Year ending December 31, Operating Capital 2016 $ 5,663 $ 449 2017 2,804 63 2018 470 — 8,937 512 Less: Amounts representing interest — 15 Total lease obligations $ 8,937 $ 497

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Summary of Accumulated Other Comprehensive Loss	The following table summarizes the activity for each component of accumulated other comprehensive loss (in thousands): Foreign Foreign Unrealized Gain Accumulated Balance as of December 31, 2012 $ 34 $ (97 ) $ — $ (63 ) Other comprehensive income (loss) before reclassifications (40 ) (28 ) — (68 ) Reclassifications to net income — 11 — 11 Other comprehensive income (loss) (40 ) (17 ) — (57 ) Balance as of December 31, 2013 $ (6 ) $ (114 ) $ — $ (120 ) Other comprehensive income (loss) before reclassifications (236 ) (18 ) — (254 ) Reclassifications to net income — 76 — 76 Other comprehensive income (loss) (236 ) 58 — (178 ) Balance as of December 31, 2014 $ (242 ) $ (56 ) $ — $ (298 ) Other comprehensive income (loss) before reclassifications (70 ) — (221 ) (291 ) Reclassifications to net income — 56 — 56 Other comprehensive income (loss) (70 ) 56 (221 ) (235 ) Balance as of December 31, 2015 $ (312 ) $ — $ (221 ) $ (533 )

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Activity	Stock option activity is summarized in the following table (in thousands, except per share amounts): Options Weighted- Weighted-Average Aggregate (1) Balance at December 31, 2014 5,815 $ 4.40 7.3 $ 57,715 Exercised (1,309 ) 2.32 Forfeited (573 ) 7.03 Balance at December 31, 2015 3,933 $ 4.71 6.1 $ 24,158 Vested and expected to vest after December 31, 2015 3,883 $ 4.67 6.1 $ 23,912 Exercisable at December 31, 2015 3,478 $ 4.35 6.1 $ 22,198 (1) Aggregate intrinsic value represents the difference between the estimated fair value of the underlying common stock and the exercise price of outstanding, in-the-money options.
Summary of Additional Information on Stock Option Granted, Vested and Exercised	The following table summarizes additional information on stock option grants, vesting and exercises (in thousands): Year Ended December 31, 2015 2014 2013 Total fair value of stock options granted $ — $ 435 $ 20,919 Total fair value of shares vested 4,668 6,238 2,427 Total intrinsic value of stock options exercised 11,317 23,420 8,258 Cash received from stock options exercised 3,037 3,285 2,797
Weighted-Average Assumptions to Estimate Fair Value of Employee Stock Options	The Company applied the following weighted-average assumptions to estimate the fair value of employee stock options using the Black-Scholes option pricing model: Year Ended 2014 2013 Expected volatility 48 % 51 % Expected term (in years) 6.0 6.0 Dividend yield 0 % 0 % Risk-free interest rate 2 % 1 %
Summary of Restricted Stock Unit Activity	A summary of restricted stock unit (“RSU”) activity for the year ended December 31, 2015 is summarized in the following table (in thousands, except per share amounts): RSUs Weighted- Weighted-Average Aggregate Intrinsic Balance at December 31, 2014 2,838 $ 16.77 6.4 $ 40,391 Granted 4,645 10.55 Released (1,332 ) 15.42 Forfeited (987 ) 14.71 Balance at December 31, 2015 5,164 $ 11.92 6.3 $ 54,535 Vested and expected to vest after December 31, 2015 4,275 $ 11.92 6.3 $ 45,149
Stock-Based Compensation Expense	Stock-based compensation expense is included in the consolidated statements of operations within the following line items (in thousands): Year Ended December 31, 2015 2014 2013 Subscription $ 838 $ 327 $ 40 Services 1,412 1,027 164 Sales and marketing 9,178 8,932 1,487 Research and development 7,418 5,623 960 General and administrative 3,712 4,473 974 Total $ 22,558 $ 20,382 $ 3,625
Summary of Unrecognized Compensation Expense, Net of Estimated Forfeitures and Weighted Average Remaining Amortization Period	A summary of our remaining unrecognized compensation expense, net of estimated forfeitures, and the weighted average remaining amortization period at December 31, 2015 related to our non-vested stock options and RSU awards is presented below (in thousands): As of December 31, 2015 Unrecognized Weighted-Average Restricted stock units $ 42,828 2.5 Stock options 7,299 1.8 $ 50,127

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate	The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax: Year Ended December 31, 2015 2014 2013 U.S. federal income tax rate 34 % 34 % 34 % State taxes 5 % 5 % 4 % Change in valuation allowance (35 %) (36 %) (31 %) Change in state rate 1 % (1 %) 4 % Stock compensation (5 %) (1 %) (4 %) Other (1 %) (1 %) (7 %) Effective tax rate (1 %) 0 % 0 %
Components of Deferred Tax Assets and Liabilities and Related Valuation Allowance	The components of the Company’s deferred tax assets and liabilities, as well as the related valuation allowance as of December 31, 2015 and 2014, are as follows (in thousands): December 31, 2015 2014 Deferred tax assets Accrued compensation and benefits $ 2,317 $ 2,058 Deferred rent liability 107 305 Stock compensation 5,931 5,440 Deferred income 1,220 1,043 Net operating loss carryforward 49,504 34,414 Other 116 37 Total deferred tax assets 59,195 43,297 Valuation allowance (55,100 ) (39,652 ) Net deferred tax asset 4,095 3,645 Deferred tax liabilities Depreciation and amortization 4,106 3,649 Total deferred tax liabilities 4,106 3,649 Net deferred tax assets (liabilities) $ (11 ) $ (4 )

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Summary of Calculation of Company's Basic and Diluted Net Loss Per Share	The following table summarizes the calculation of the Company’s basic and diluted net income (loss) per share under the two-class method attributable to common stockholders during the years ended December 31, 2015, 2014 and 2013 (in thousands, except per share amounts): Year Ended December 31, 2015 2014 2013 Numerator: Net loss $ (44,859 ) $ (41,751 ) $ (14,161 ) Non-cumulative dividends to preferred stockholders — — — Net loss attributable to common stockholders $ (44,859 ) $ (41,751 ) $ (14,161 ) Denominator: Weighted-average common stock outstanding, basic 51,291 41,921 21,121 Effect of potentially dilutive stock options and restricted stock units — — — Weighted-average common stock outstanding, diluted 51,291 41,921 21,121 Net loss per share, basic and diluted $ (0.87 ) $ (1.00 ) $ (0.67 )
Summary of Potential Shares Excluded from Calculation of Diluted Net Loss Per Share	The following potential shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because their effect would have been anti-dilutive for the periods presented (in thousands): December 31, 2015 2014 2013 Convertible preferred stock — — 19,247 Stock options 3,933 5,815 7,790 Restricted stock units 5,164 2,838 1,093 Common stock subject to repurchase 31 154 408 9,128 8,807 28,538

Valuation and Qualifying Acco32

Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]
Changes in Valuation and Qualifying Accounts	Changes in valuation and qualifying accounts consisted of the following (in thousands): Additions Beginning Charged to Charged to Write-offs Deductions Ending 2015 Allowance for doubtful accounts $ — $ — $ (49 ) $ — $ — $ (49 ) Deferred tax valuation allowance (39,652 ) (15,448 ) — — — (55,100 ) 2014 Allowance for doubtful accounts $ (361 ) $ — $ — $ — $ 361 $ — Deferred tax valuation allowance (24,345 ) (15,307 ) — — — (39,652 ) 2013 Allowance for doubtful accounts $ — $ — $ (361 ) $ — $ — $ (361 ) Deferred tax valuation allowance (19,944 ) (4,401 ) — — — (24,345 )

Company Overview - Additional I

Company Overview - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued		50,372,000		52,557,000
Proceeds from initial public offering, net of underwriting discounts and commissions	$ 121,800	$ 123,955
Payment of stock issuance costs in connection with initial public offering		$ 1,873	$ 273
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued	7,015,000
Common stock shares issued to underwriters	915,000
Share price per share under underwriter	$ 19
Payment of stock issuance costs in connection with initial public offering	$ 2,100

Summary of Significant Accoun34

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)Segment	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Schedule Of Significant Accounting Policies [Line Items]
Advertisement cost	$ 2,000,000	$ 1,900,000	$ 500,000
Percentage of estimated fair value of common stock at grant date set to equal exercise price of incentive stock option award for 10% or more shareholders	110.00%
Number of operating segment | Segment	1
Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Service period for revenue recognition	1 year
Percentage of shareholders for which grants are exercisable at 110 percent	10.00%
Percentage of tax benefit to be realized upon settlement	50.00%
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Service period for revenue recognition	6 years
Research and Development [Member]
Schedule Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets	$ 0	0	$ 600,000
Scenario, Previously Reported [Member]
Schedule Of Significant Accounting Policies [Line Items]
Increased revenue in the current period for adjustments related to prior periods		300,000
Increased gains on foreign currency in the current period for adjustments related to prior periods		$ 200,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Minimum Threshold For Disclosure [Member]
Schedule Of Significant Accounting Policies [Line Items]
Threshold percentage represented by major customers	10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Threshold percentage represented by major customers	10.00%
Revenue [Member] | Customer Concentration Risk [Member] | Minimum Threshold For Disclosure [Member]
Schedule Of Significant Accounting Policies [Line Items]
Threshold percentage represented by major customers	10.00%
Revenue [Member] | Customer Concentration Risk [Member] | Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Threshold percentage represented by major customers	10.00%

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Summary of Revenue or Accounts Receivable Percentage of Major Customers (Detail) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue [Member] | Customer A [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	15.00%	12.00%	11.00%
Revenue [Member] | Customer B [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%	10.00%	14.00%
Revenue [Member] | Customer C [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage			13.00%
Accounts Receivable [Member] | Customer A [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	12.00%	10.00%
Accounts Receivable [Member] | Customer B [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	31.00%
Accounts Receivable [Member] | Customer C [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage		17.00%

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Summary of Revenue or Accounts Receivable Percentage of Major Customers (Parenthetical) (Detail) - Maximum [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015
Revenue [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%
Accounts Receivable [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%

Summary of Significant Accoun37

Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2015
Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	3 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	7 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets, description	Lesser of remaining term or estimated useful life
Minimum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	2 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Total	$ 90,428	$ 108,274
Cash and Cash Equivalents [Member]
Assets:
Total	18,947	108,274
Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Assets:
Total	18,947	108,274
Short-Term Investments [Member]
Assets:
Total	35,017
Short-Term Investments [Member] | Commercial Paper [Member]
Assets:
Total	6,245
Short-Term Investments [Member] | Corporate Notes and Bonds [Member]
Assets:
Total	27,093
Short-Term Investments [Member] | Certificates of Deposit [Member]
Assets:
Total	1,679
Long-Term Investments [Member]
Assets:
Total	36,464
Long-Term Investments [Member] | Corporate Notes and Bonds [Member]
Assets:
Total	28,581
Long-Term Investments [Member] | Certificates of Deposit [Member]
Assets:
Total	959
Long-Term Investments [Member] | U.S. Government and Agency [Member]
Assets:
Total	6,924
Fair Value, Inputs, Level 1 [Member]
Assets:
Total	18,947	108,274
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Assets:
Total	18,947	108,274
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Assets:
Total	18,947	$ 108,274
Fair Value, Inputs, Level 2 [Member]
Assets:
Total	71,481
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member]
Assets:
Total	35,017
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] | Commercial Paper [Member]
Assets:
Total	6,245
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] | Corporate Notes and Bonds [Member]
Assets:
Total	27,093
Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member] | Certificates of Deposit [Member]
Assets:
Total	1,679
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member]
Assets:
Total	36,464
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Corporate Notes and Bonds [Member]
Assets:
Total	28,581
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Certificates of Deposit [Member]
Assets:
Total	959
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | U.S. Government and Agency [Member]
Assets:
Total	$ 6,924

Cash Equivalents and Investme39

Cash Equivalents and Investments - Summary of Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Investments in Available-for-Sale Securities Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 90,649
Unrealized Gains	0
Unrealized Losses	(221)
Estimated Fair Value	90,428
Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,947	$ 108,274
Unrealized Gains	0	0
Estimated Fair Value	18,947	108,274
Cash Equivalents [Member] | Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,947	108,274
Unrealized Gains	0	0
Estimated Fair Value	18,947	$ 108,274
Total Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	71,702
Unrealized Gains	0
Unrealized Losses	(221)
Estimated Fair Value	71,481
Commercial Paper [Member] | Total Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,246
Unrealized Gains	0
Unrealized Losses	(1)
Estimated Fair Value	6,245
Corporate Notes and Bonds [Member] | Total Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	55,861
Unrealized Gains	0
Unrealized Losses	(187)
Estimated Fair Value	55,674
Certificates of Deposit [Member] | Total Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,640
Unrealized Gains	0
Unrealized Losses	(2)
Estimated Fair Value	2,638
U.S. Government and Agency [Member] | Total Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,955
Unrealized Gains	0
Unrealized Losses	(31)
Estimated Fair Value	$ 6,924

Cash Equivalents and Investme40

Cash Equivalents and Investments - Additional Information (Detail)	Dec. 31, 2015Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Number of investments held in continuous unrealized loss position greater than one year	0

Cash Equivalents and Investme41

Cash Equivalents and Investments - Estimated Fair Value of Cash Equivalents and Investments in Available-for-Sale Securities Aggregated by Investment Category and Classified by Contractual Maturity Date (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Schedule of Available-for-sale Securities [Line Items]
Less Than 1 Year	$ 53,964
1 Year or Greater	36,464
Total	90,428
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 1 Year	6,245
Total	6,245
Corporate Notes and Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 1 Year	27,093
1 Year or Greater	28,581
Total	55,674
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 1 Year	1,679
1 Year or Greater	959
Total	2,638
U.S. Government and Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
1 Year or Greater	6,924
Total	6,924
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less Than 1 Year	18,947
Total	$ 18,947

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Equipment	$ 9,204	$ 7,748
Software	26,685	19,574
Furniture and fixtures	383	337
Leasehold improvements	2,921	2,594
Total property and equipment	39,193	30,253
Accumulated depreciation and amortization	(21,314)	(12,581)
Total property and equipment, net	$ 17,879	$ 17,672

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Capital lease obligation	$ 500	$ 1,000
Property and equipment	39,193	30,253
Accumulated depreciation	21,314	12,581
Capitalized internal-use software development costs	9,500	9,900
Capitalized internal-use software cost, net	12,900	11,600
Amortization expense related to capitalized internal-use software	8,200	4,600	$ 2,200
Capital Lease Obligations [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	1,700	1,700
Accumulated depreciation	$ 1,200	$ 700

Property and Equipment - Breako

Property and Equipment - Breakout of Depreciation and Amortization Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 11,342	$ 7,198	$ 3,766
Subscription [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	4,938	2,858	1,340
Services [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	275	220	152
Sales and Marketing [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	455	420	314
Research and Development [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	5,471	3,383	1,752
General and Administrative [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 203	$ 317	$ 208

Debt - Additional Information (

Debt - Additional Information (Detail) - Silicon Valley Bank [Member] - Revolving Line of Credit [Member] - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Revolving line of credit, maturity period	3 years
Revolving line of credit, maturity date		2018-06
Revolving line of credit	$ 30,000,000
Maximum borrowing capacity as percentage of accounts receivable	80.00%
Revolving line of credit, interest rate description		Interest at either the prime rate or the LIBOR plus 250 basis points
Revolving line of credit, amount outstanding		$ 0
LIBOR Rate [Member]
Debt Instrument [Line Items]
Revolving line of credit, basis spread	2.50%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Contingencies And Commitments [Line Items]
Operating lease agreement expire period		2,018
Capital lease term	36 months
Weighted-average interest rate implicit in leases	5.50%
Rent expense under operating leases		$ 5.5	$ 4.4	$ 3
Total outstanding letters of credit		1.3	$ 1.3
Arlington, Virginia [Member]
Contingencies And Commitments [Line Items]
Total outstanding letters of credit		0.6
San Francisco, California [Member]
Contingencies And Commitments [Line Items]
Total outstanding letters of credit		$ 0.7

Commitments and Contingencies47

Commitments and Contingencies - Summary of Lease Commitments (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Leases [Abstract]
Operating Leases, 2016	$ 5,663
Operating Leases, 2017	2,804
Operating Leases, 2018	470
Total lease obligations	8,937
Capital Leases, 2016	449
Capital Leases, 2017	63
Capital Leases, 2018	0
Capital Leases, Gross	512
Less: Amounts representing interest	15
Total lease obligations, Capital Leases	$ 497

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015Class_of_Stockshares	Dec. 31, 2014Class_of_Stock$ / sharesshares	Dec. 31, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of classes of stock | Class_of_Stock	2	2
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	500,000,000	500,000,000
Series A, Series B, and Series C Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares issued			19,200,000
Preferred stock, shares outstanding			19,200,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of stock, Shares converted	19,200,000
Shares, issued			1,810,000
Undesignated Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized	19,400,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares, vested		100,000
Weighted average grant date fair value, vested | $ / shares		$ 2.09
Shares, issued	0
Shares,outstanding	0

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive Income (loss), Beginning balance	$ (298)	$ (120)	$ (63)
Accumulated other comprehensive loss, Other comprehensive income (loss) before reclassifications	(291)	(254)	(68)
Accumulated other comprehensive loss, Reclassifications to net income	56	76	11
Total other comprehensive income (loss)	(235)	(178)	(57)
Accumulated other comprehensive Income (loss), Ending balance	(533)	(298)	(120)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive Income (loss), Beginning balance	(242)	(6)	34
Accumulated other comprehensive loss, Other comprehensive income (loss) before reclassifications	(70)	(236)	(40)
Total other comprehensive income (loss)	(70)	(236)	(40)
Accumulated other comprehensive Income (loss), Ending balance	(312)	(242)	(6)
Foreign Currency Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive Income (loss), Beginning balance	(56)	(114)	(97)
Accumulated other comprehensive loss, Other comprehensive income (loss) before reclassifications		(18)	(28)
Accumulated other comprehensive loss, Reclassifications to net income	56	76	11
Total other comprehensive income (loss)	56	58	(17)
Accumulated other comprehensive Income (loss), Ending balance		$ (56)	$ (114)
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, Other comprehensive income (loss) before reclassifications	(221)
Total other comprehensive income (loss)	(221)
Accumulated other comprehensive Income (loss), Ending balance	$ (221)

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance	25,000,000
Shares available for issuance	4,800,000
Capitalized stock-based compensation expense	$ 1.7	$ 1.2	$ 0.1
2007 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options subject to repurchase	0	200,000
Aggregate exercise price	$ 0.1	$ 0.4
2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity awards vesting period	4 years
Stock Options [Member] | 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity awards expire period	10 years
Restricted Stock Units [Member] | 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity awards expire period	7 years

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding, Beginning Balance	5,815
Options Outstanding, Exercised	(1,309)
Options Outstanding, Forfeited	(573)
Options Outstanding, Ending Balance	3,933	5,815
Options Outstanding, Vested and expected to vest Ending Balance	3,883
Options Outstanding, Exercisable Ending Balance	3,478
Weighted-Average Exercise Price, Beginning Balance	$ 4.40
Weighted-Average Exercise Price, Exercised	2.32
Weighted-Average Exercise Price, Forfeited	7.03
Weighted-Average Exercise Price, Ending Balance	4.71	$ 4.40
Weighted-Average Exercise Price, Vested and expected to vest Ending Balance	4.67
Weighted-Average Exercise Price, Exercisable Ending Balance	$ 4.35
Weighted-Average Remaining Contractual Term	6 years 1 month 6 days	7 years 3 months 18 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest	6 years 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable	6 years 1 month 6 days
Aggregate Intrinsic Value, Beginning Balance	$ 57,715
Aggregate Intrinsic Value, Ending Balance	24,158	$ 57,715
Aggregate Intrinsic Value, Vested or expected to vest Ending Balance	23,912
Aggregate Intrinsic Value, Exercisable Ending Balance	$ 22,198

Stock-Based Compensation - Su52

Stock-Based Compensation - Summary of Additional Information on Stock Option Granted, Vested and Exercised (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total fair value of stock options granted		$ 435	$ 20,919
Total fair value of shares vested	$ 4,668	6,238	2,427
Total intrinsic value of stock options exercised	11,317	23,420	8,258
Cash received from stock options exercised	$ 3,037	$ 3,285	$ 2,797

Stock-Based Compensation - Weig

Stock-Based Compensation - Weighted-Average Assumptions to Estimate Fair Value of Employee Stock Options (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected volatility	48.00%	51.00%
Expected term (in years)	6 years	6 years
Dividend yield	0.00%	0.00%
Risk-free interest rate	2.00%	1.00%

Stock-Based Compensation - Su54

Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs Outstanding, Beginning balance	2,838
RSUs Outstanding, Granted	4,645
RSUs Outstanding, Released	(1,332)
RSUs Outstanding, Forfeited	(987)
RSUs Outstanding, Ending balance	5,164	2,838
RSUs Outstanding, Vested and expected to vest after December 31, 2015	4,275
Weighted-Average Grant Date Fair Value, Beginning balance	$ 16.77
Weighted-Average Grant Date Fair Value, Granted	10.55
Weighted-Average Grant Date Fair Value, Released	15.42
Weighted-Average Grant Date Fair Value, Forfeited	14.71
Weighted-Average Grant Date Fair Value, Ending balance	11.92	$ 16.77
Weighted-Average Grant Date Fair Value, Vested and expected to vest after December 31, 2015	$ 11.92
Weighted-Average Remaining Contractual Term (Years)	6 years 3 months 18 days	6 years 4 months 24 days
Weighted-Average Remaining Contractual Term (Years), Vested and expected to vest after December 31, 2015	6 years 3 months 18 days
RSU Aggregate Intrinsic Value, Beginning balance	$ 40,391
RSU Aggregate Intrinsic Value, Ending balance	54,535	$ 40,391
RSU Aggregate Intrinsic Value, Vested and expected to vest after December 31, 2015	$ 45,149

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 22,558	$ 20,382	$ 3,625
Subscription [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	838	327	40
Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	1,412	1,027	164
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	9,178	8,932	1,487
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	7,418	5,623	960
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 3,712	$ 4,473	$ 974

Stock-Based Compensation - Su56

Stock-Based Compensation - Summary of Unrecognized Compensation Expense, Net of Estimated Forfeitures and Weighted Average Remaining Amortization Period (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 50,127
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 7,299
Weighted-Average Amortization Period (Years)	1 year 9 months 18 days
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$ 42,828
Weighted-Average Amortization Period (Years)	2 years 6 months

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal income tax rate	34.00%	34.00%	34.00%
State taxes	5.00%	5.00%	4.00%
Change in valuation allowance	(35.00%)	(36.00%)	(31.00%)
Change in state rate	1.00%	(1.00%)	4.00%
Stock compensation	(5.00%)	(1.00%)	(4.00%)
Other	(1.00%)	(1.00%)	(7.00%)
Effective tax rate	(1.00%)	0.00%	0.00%

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets and Liabilities and Related Valuation Allowance (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets
Accrued compensation and benefits	$ 2,317	$ 2,058
Deferred rent liability	107	305
Stock compensation	5,931	5,440
Deferred income	1,220	1,043
Net operating loss carryforward	49,504	34,414
Other	116	37
Total deferred tax assets	59,195	43,297
Valuation allowance	(55,100)	(39,652)
Net deferred tax asset	4,095	3,645
Deferred tax liabilities
Depreciation and amortization	4,106	3,649
Total deferred tax liabilities	4,106	3,649
Net deferred tax assets (liabilities)	$ (11)	$ (4)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards not recognized	$ 3,900,000
Operating loss carryforwards, limitations on use	The Company’s net operating loss carryforwards may be used to offset future taxable income and thereby reduce the Company’s U.S. Federal and state income taxes otherwise payable. Section 382 of the Internal Revenue Code of 1986, as amended, (“Section 382”) imposes an annual limit on the ability, of a corporation that undergoes an ownership change, to utilize its net operating loss carryforwards to reduce its current year income tax liability. In the event of certain changes in the Company’s stockholder base, the Company’s ability to utilize certain net operating losses to offset future taxable income in any particular year may be limited pursuant to Section 382.
Valuation allowances	$ (55,100,000)	$ (39,652,000)
Unrecognized tax benefits	0
U.S Federal and State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 133,500,000	$ 91,200,000
Net operating loss carryforwards expiration period	2,027
U.S Federal and State [Member] | Additional Paid-in Capital [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards to be recognized as benefit	$ 9,900,000

Net Income (Loss) Per Share - S

Net Income (Loss) Per Share - Summary of Calculation of Company's Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net loss	$ (44,859)	$ (41,751)	$ (14,161)
Non-cumulative dividends to preferred stockholders	0	0	0
Net loss attributable to common stockholders	$ (44,859)	$ (41,751)	$ (14,161)
Denominator:
Weighted-average common stock outstanding, basic	51,291	41,921	21,121
Effect of potentially dilutive stock options and restricted stock units	0	0	0
Weighted-average common stock outstanding, diluted	51,291	41,921	21,121
Net loss per share, basic and diluted	$ (0.87)	$ (1)	$ (0.67)

Net Income (Loss) Per Share -61

Net Income (Loss) Per Share - Summary of Potential Shares Excluded from Calculation of Diluted Net Loss per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted net loss per share	9,128	8,807	28,538
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted net loss per share			19,247
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted net loss per share	3,933	5,815	7,790
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted net loss per share	5,164	2,838	1,093
Common Stock Subject to Repurchase [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from calculation of diluted net loss per share	31	154	408

Geographic Information - Additi

Geographic Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
United States [Member] | Revenue [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Revenue concentration percentage	91.00%	86.00%	90.00%

Employee Benefit and Retireme63

Employee Benefit and Retirement Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contribution per employee (in percent)	100.00%
Defined contribution retirement plan description	Employees that are at least 21 years of age are eligible to participate in the 401k Plan immediately upon hiring. Under the 401k Plan, eligible employees may contribute up to 100% of either pre-tax compensation or after-tax compensation through a Roth 401(k) deferral contribution, up to the annual Internal Revenue Service dollar limit for the applicable year.
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Employees age eligible to participate in plan	21 years

Valuation and Qualifying Acco64

Valuation and Qualifying Accounts - Changes in Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance		$ (361)
Additions, Charged to Deferred Revenue	$ (49)		$ (361)
Write-offs	0	0	0
Deductions		361
Ending Balance	(49)		(361)
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	(39,652)	(24,345)	(19,944)
Additions, Charged to Operations	(15,448)	(15,307)	(4,401)
Write-offs	0	0	0
Ending Balance	$ (55,100)	$ (39,652)	$ (24,345)