Opower 10-K 13 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 28, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	OPWR
Entity Registrant Name	OPOWER, INC.
Entity Central Index Key	1412043
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		50,734,651
Entity Public Float			$381.80

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$125,725	$28,819
Accounts receivable, net of allowance for doubtful accounts of $361 and $0 at December 31, 2013 and December 31, 2014, respectively	36,295	20,228
Prepaid expenses and other current assets	4,654	1,988
Total current assets	166,674	51,035
Property and equipment, net	17,672	10,813
Other assets	151	1,287
Total assets	184,497	63,135
Current liabilities:
Accounts payable	1,400	1,163
Accrued expenses	6,367	4,452
Deferred revenue	61,989	50,623
Accrued compensation and benefits	8,337	4,817
Other current liabilities	2,091	1,831
Total current liabilities	80,184	62,886
Deferred revenue	2,280	1,767
Notes payable		2,418
Other liabilities	1,232	2,327
Total liabilities	83,696	69,398
Commitments and contingencies (see Note 7)
Stockholders' equity (deficit):
Preferred stock, value
Common stock, par value $0.000005 per share - 500,000 shares authorized; 22,113 and 50,372 shares issued and outstanding as of December 31, 2013 and December 31, 2014, respectively	0	0
Additional paid-in capital	226,093	9,407
Accumulated deficit	-124,994	-83,243
Accumulated other comprehensive loss	-298	-120
Total stockholders' equity (deficit)	100,801	-6,263
Total liabilities and stockholders' equity (deficit)	184,497	63,135
Series A Convertible Preferred Stock [Member]
Stockholders' equity (deficit):
Preferred stock, value		1,466
Series B Convertible Preferred Stock [Member]
Stockholders' equity (deficit):
Preferred stock, value		16,355
Series C Convertible Preferred Stock [Member]
Stockholders' equity (deficit):
Preferred stock, value		49,872
Convertible Preferred Stock [Member]
Stockholders' equity (deficit):
Preferred stock, value		$67,693

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts	$0	$361
Preferred stock, par value	$0.00
Preferred stock, shares authorized	25,000,000
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	50,372,000	22,113,000
Common stock, shares outstanding	50,372,000	22,113,000
Series A Convertible Preferred Stock [Member]
Preferred stock, par value		$0.00
Preferred stock, shares authorized		5,378,000
Preferred stock, shares issued		5,378,000
Preferred stock, shares outstanding		5,378,000
Preferred stock, liquidation preference		1,545
Series B Convertible Preferred Stock [Member]
Preferred stock, par value		$0.00
Preferred stock, shares authorized		8,376,000
Preferred stock, shares issued		8,251,000
Preferred stock, shares outstanding		8,251,000
Preferred stock, liquidation preference		16,448
Series C Convertible Preferred Stock [Member]
Preferred stock, par value		$0.00
Preferred stock, shares authorized		5,674,000
Preferred stock, shares issued		5,618,000
Preferred stock, shares outstanding		5,618,000
Preferred stock, liquidation preference		$50,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenue	$128,439	$88,703	$51,756
Cost of revenue	44,125	32,092	19,580
Gross profit	84,314	56,611	32,176
Operating expenses:
Sales and marketing	61,267	33,116	22,458
Research and development	45,999	29,496	18,006
General and administrative	17,844	7,816	4,071
Total operating expenses	125,110	70,428	44,535
Operating loss	-40,796	-13,817	-12,359
Other income (expense):
Gain (loss) on foreign currency	-1,361	-220	54
Interest expense	-114	-187
Other, net	433	86
Loss before income taxes	-41,838	-14,138	-12,305
Provision for (benefit from) income taxes	-87	23	27
Net loss	($41,751)	($14,161)	($12,332)
Weighted-average common stock outstanding:
Basic and diluted	41,921	21,121	19,442
Net loss per share:
Basic and diluted	($1)	($0.67)	($0.63)

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net loss	($41,751)	($14,161)	($12,332)
Other comprehensive income (loss)
Foreign currency translation	-236	-40	51
Unrealized gain (loss) on hedge transactions, net	58	-17	-97
Total other comprehensive loss	-178	-57	-46
Total comprehensive loss	($41,929)	($14,218)	($12,378)

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (Deficit) (USD $)	Total	IPO [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
In Thousands, except Share data	USD ($)	USD ($)	Series A Convertible Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Series C Convertible Preferred Stock [Member]	IPO [Member]	IPO [Member]	IPO [Member]		IPO [Member]	USD ($)	IPO [Member]	USD ($)	USD ($)	USD ($)
			USD ($)	USD ($)	USD ($)	Series A Convertible Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Series C Convertible Preferred Stock [Member]				USD ($)
						USD ($)	USD ($)	USD ($)
Beginning Balance at Dec. 31, 2011	$12,248		$1,466	$16,355	$49,872						$1,322			($56,750)	($17)
Beginning Balance, Shares at Dec. 31, 2011			5,378,000	8,251,000	5,618,000				19,415,000
Issuance of common stock	629										629
Issuance of common stock, Shares									912,000
Vesting of common stock subject to repurchase	360										360
Repurchase of common stock	-1												-1
Repurchase of common stock, Shares									-1,000
Tax settlements related to equity-based plans	-59										-59
Tax settlements related to equity-based plans, Shares									-23,000
Stock-based compensation	1,187										1,187
Foreign currency translation	51														51
Unrealized gain on hedge transactions, net	-97														-97
Net loss	-12,332													-12,332
Ending Balance at Dec. 31, 2012	1,986		1,466	16,355	49,872						3,439		-1	-69,082	-63
Ending Balance, Shares at Dec. 31, 2012			5,378,000	8,251,000	5,618,000				20,303,000
Issuance of common stock	1,745										1,744		1
Issuance of common stock, Shares									1,810,000
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			5,378,000	8,251,000	5,618,000				22,113,000
Issuance of common stock upon exercise of stock options	3,285										3,285
Issuance of common stock upon exercise of stock options, Shares	1,559,000								1,559,000
Issuance of common stock		121,809										121,809
Issuance of common stock, Shares										7,015,000
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						-5,378,000	-8,251,000	-5,618,000		19,246,000
Vesting of common stock subject to repurchase	782										782
Conversion of convertible debt into common stock		2,996										2,996
Issuance of common stock upon RSU release, net of shares withheld for taxes	-1,482										-1,482
Conversion of convertible debt into common stock, Shares										158,000
Issuance of common stock upon RSU release, net of shares withheld for taxes, Shares									281,000
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									50,372,000

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net loss	($41,751,000)	($14,161,000)	($12,332,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	7,198,000	3,766,000	1,599,000
Stock-based compensation expense	20,382,000	3,625,000	1,187,000
Foreign currency loss (gain)	994,000	-8,000
Non-cash interest expense	52,000	159,000
Asset impairment	82,000	640,000
Other	150,000	35,000	3,000
Changes in operating assets and liabilities:
Accounts receivable	-15,885,000	-9,668,000	-6,504,000
Prepaid expenses and other current assets	-2,055,000	-720,000	-320,000
Other assets	16,000	-383,000	-44,000
Accounts payable	249,000	339,000	-618,000
Accrued expenses	2,292,000	1,886,000	804,000
Accrued compensation and benefits	3,554,000	1,387,000	1,089,000
Deferred revenue	11,566,000	19,995,000	15,268,000
Other liabilities	290,000	-225,000	-154,000
Net cash provided by (used in) operating activities	-12,866,000	6,667,000	-22,000
Investing Activities
Additions to property and equipment	-12,431,000	-7,331,000	-4,330,000
Proceeds from the sale of assets		3,000	4,000
Net cash used in investing activities	-12,431,000	-7,328,000	-4,326,000
Financing Activities
Proceeds from issuance of common stock	3,285,000	2,797,000	629,000
Proceeds from initial public offering, net of underwriting discounts and commissions	123,955,000
Repurchase of common stock			-1,000
Tax settlements related to equity-based plans			-59,000
Taxes paid related to net share settlement of equity awards	-1,482,000
Issuance of notes payable		2,500,000
Payment of offering costs	-1,873,000	-273,000
Principal payments on capital lease obligations	-496,000	-116,000
Net cash provided by financing activities	123,389,000	4,908,000	569,000
Effect of exchange rate changes on cash and cash equivalents	-1,186,000	-25,000	43,000
Net increase (decrease) in cash and cash equivalents	96,906,000	4,222,000	-3,736,000
Cash and cash equivalents, beginning of period	28,819,000	24,597,000	28,333,000
Cash and cash equivalents, end of period	125,725,000	28,819,000	24,597,000
Supplemental cash flow information
Cash paid for income taxes, net of tax refunds	7,000	9,000	1,000
Cash paid for interest	66,000	21,000
Supplemental disclosure of non-cash investing and financing activities
Assets acquired under capital leases	263,000	1,432,000
Accrued property and equipment purchases	235,000	247,000
Capitalized stock-based compensation	1,221,000	121,000	0
Vesting of common stock subject to repurchase	782,000	478,000
Accrued deferred offering costs		539,000
Conversion of convertible preferred stock into common stock	67,693,000
Conversion of convertible debt into common stock	$2,996,000

Company_Overview

Company Overview	12 Months Ended
	Dec. 31, 2014
Accounting Policies [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 customer-facing applications that reduce energy demand and improve customer perception of the utility. The Company’s software analyzes energy data and presents personalized insights to consumers in order to motivate reductions in energy consumption.

Initial_Public_Offering

Initial Public Offering	12 Months Ended
	Dec. 31, 2014
Text Block [Abstract]
Initial Public Offering	2. Initial Public Offering
	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. Upon the closing of the IPO, all shares of the Company’s outstanding convertible preferred stock automatically converted into 19,246,714 shares of common stock, and the Company’s subordinated convertible promissory note automatically converted into 157,664 shares of common stock. Offering expenses of $0.8 million were recorded in other assets on the condensed consolidated balance sheets as of December 31, 2013 and $2.1 million were reclassified to additional paid-in capital in connection with the IPO.

Summary_of_Significant_Account

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

3. 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 updated its methodology for allocating certain general and administrative costs to more closely align these costs to the functional departments consuming the related services. As a result, certain prior period costs have been reclassified from general and administrative expenses to cost of revenue, sales and marketing expenses, and research and development expenses primarily based on the headcount in each of these functional areas. The reclassifications for the year ended December 31, 2012 reduced general and administrative expenses by $3.7 million and increased cost of revenue, sales and marketing expenses, and research and development expenses by $0.7 million, $1.1 million, and $1.9 million, respectively. The reclassifications for the year ended December 31, 2013 reduced general and administrative expenses by $5.8 million and increased cost of revenue, sales and marketing expenses, and research and development expenses by $0.8 million, $2.6 million and $2.4 million, respectively. These reclassifications had no effect on previously reported operating loss, net loss or cash flows.

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.

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 investments with original maturities of three months or less to be cash and cash equivalents.

Accounts Receivable

Accounts receivable are derived from services to be delivered to utility providers and are stated at their net realizable value. Each month the Company reviews its receivables on a customer-by-customer 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 and accounts receivable. The Company maintains the majority of its cash and cash equivalents with one financial institution, 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 customers and maintains an allowance for doubtful accounts as deemed necessary. Collection efforts from long-established utilities have been historically successful, so the Company believes credit risk to be low.

The following table summarizes those customers who represented at least 10% of revenue or accounts receivable for the periods presented:

Revenue

Accounts Receivable

Year Ended

December 31,

December 31,

2012

2013

2014

2013

2014

Customer A

*

11

%

12

%

*

10

%

Customer B

15

%

14

%

10

%

*

*

Customer C

14

%

13

%

*

22

%

17

%

Customer D

*

*

*

12

%

*

Customer E

*

*

*

10

%

*

*

=xA0;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. 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 relates to a capitalized internal-use software project termination. During the year ended December 31, 2014, we recorded a non-cash asset impairment related to long-lived assets of $0.1 million. There was no impairment of long-lived assets during the year ended December 31, 2012.

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: Observable inputs. Quoted prices in active markets for identical assets and liabilities;

•

Level 2: Observable inputs other than the quoted price. Includes quoted prices for similar instruments, quoted prices for identical or similar instruments in inactive markets and amounts derived from valuation models where all significant inputs are observable in active markets; and

•

Level 3: Unobservable inputs. Includes amounts derived from valuation models where one or more significant inputs are unobservable and require the Company to develop relevant assumptions.

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 (see Note 6 for further details). 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 utility providers based on a service provided to those utilities, which includes analyzing data provided by the utilities and using that data to encourage utility customers to reduce energy consumption and improve satisfaction. The Company generates substantially all of its revenue from service contracts.

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 contracts is segregated into separate accounting units, the predominant units of which are data analysis and web tools, and recognized on a straight-line basis over the related service period for each accounting unit.

The Company recognizes revenues when the following criteria have been met:

•

Persuasive evidence of an arrangement exists: A signed contract or any other written documentation from the customer that confirms their explicit acceptance of a specific statement of work is deemed to represent persuasive evidence of an arrangement.

•

Delivery has occurred: For data analysis, delivery is considered to have occurred once a data connection with a utility has been configured and reports are being received by end-users. For web tools, delivery is considered to have occurred once the web service is live and accessible by end-users.

•

The price is fixed or determinable: The Company considers the contract price to be fixed or determinable once the fees are contractually agreed upon with the customer.

•

Collection is reasonably assured: Each customer is evaluated for creditworthiness both at the inception of their arrangement and periodically throughout the period of time over which payments are due. Collection is deemed reasonably assured if the Company expects that the customer has the intent and ability to pay all amounts due, as scheduled. If it is determined that collection is not reasonably assured, revenue is deferred and recognized only upon cash collection.

Revenue recognition for each contract corresponds directly with the service period. The revenue recognition start date begins when delivery has occurred, which occurs approximately seven months after a new customer contract is signed. Service may last from one to five 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 contracts.

The Company charges customers set-up fees at the initiation of new contracts. The set-up fees are deferred and recognized ratably over the expected customer relationship period. The corresponding set-up 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 amounts are fixed or determinable 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 customer is not recognized until the performance criteria are met or the customer’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 consists primarily of report printing and shipping costs, data analysis and communication costs, hosting costs, personnel costs related to software implementation and maintenance, the cost to train and support customers, the cost of licenses to access consolidated information about energy consumers, depreciation of fixed assets and amortization expense associated with capitalized software.

Sales and Marketing Costs

Advertising costs are expensed as incurred and relate to promotional materials for customers and general brand exposure. These costs amounted to $0.5 million, $0.5 million, and $1.9 million for the years ended December 31, 2012, 2013 and 2014, 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 customer 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: The expected volatility of the Company’s shares is estimated using the historical volatility of a peer group of public companies over the most recent period commensurate with the estimated expected term of the awards. The Company’s selected peer group includes public enterprise cloud-based application providers that focus on a particular industry and contain a marketing component within their service offering.

•

Expected term: For employee stock option awards, the Company uses an estimated term equal to the weighted period between the vesting period and the contract life of the option. This method is known as the simplified method and is utilized due to the Company’s relatively short history. For non-employees, the Company uses an expected term equal to the remaining contract term.

•

Dividend yield: The Company has not paid dividends and does not anticipate paying a cash dividend in the foreseeable future and, accordingly, uses an expected dividend yield of zero.

•

Risk-free interest rate: The Company bases the risk-free interest rate on the implied yield available on a U.S. Treasury note with a term equal to the estimated expected term of the awards.

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 (deficit) and are excluded from net loss. The Company’s other comprehensive income (loss) is comprised of foreign currency translation adjustments 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 has 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 July 2013, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This guidance states that a liability related to an unrecognized tax benefit should be offset against a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The new guidance is effective on a prospective basis for annual and interim periods beginning after December 15, 2013, but early adoption and retrospective application are permitted. The Company adopted the guidance effective January 1, 2014 and it did not have a material impact on its consolidated financial statements.

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360). The ASU raises the threshold for a disposal to qualify as discontinued operations and requires new disclosures for individually significant disposal transactions that do not meet the definition of a discontinued operation. Under the new standard, companies report discontinued operations when they have a disposal that represents a strategic shift that has or will have a major impact on operations or financial results. The ASU will be applied prospectively and is effective for annual periods, and interim periods within those years, beginning after December 15, 2014. The Company will adopt the guidance effective January 1, 2015 and does not currently expect it to have a material impact on its consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	4. 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, 2013 and December 31, 2014 (in thousands):
			December 31, 2013												December 31, 2014
			Fair Value			Level 1			Level 2			Level 3			Fair Value		Level 1		Level 2		Level 3
	Assets:
	Cash equivalents (1):
	Money market funds (2)		$	15,511		$	15,511		$	—		$	—		$	108,274	$	108,274	$	—	$	—
	Total		$	15,511		$	15,511		$	—		$	—		$	108,274	$	108,274	$	—	$	—
	Liabilities:
	Foreign currency derivative contracts		$	(41	)	$	—		$	(41	)	$	—		$	2	$	—	$	2	$	—
	Convertible debt derivative			(388	)		—			—			(388	)		—		—		—		—
	Total		$	(429	)	$	—		$	(41	)	$	(388	)	$	2	$	—	$	2	$	—
	(1)	Included in cash and cash equivalents on the condensed consolidated balance sheets.
	(2)	Money market funds associated with the Company’s overnight investment sweep account.
	The foreign currency derivative contracts are classified within Level 2 because they are valued using alternative pricing sources and models utilizing observable market inputs for similar instruments. The fair value measurement of the convertible debt derivative was determined through the use of a probability-weighted expected return model (“PWERM”). The PWERM considers the timing and cash flows related to each potential conversion scenario and applies a percentage likelihood of occurrence in order to develop an estimated fair value for the instrument as a whole. This valuation methodology is based on unobservable estimates and judgments, and therefore is classified as a Level 3 fair value measurement.
	The following table presents a reconciliation of the convertible debt derivative instrument measured at fair value as of December 31, 2013 and December 31, 2014 using significant unobservable inputs, and the amount of loss recorded in the Company’s consolidated statements of operations as a result of changes in fair value (in thousands):
			Year Ended
			December 31,
			2013			2014
	Convertible debt derivative
	Balance, beginning of year		$	—		$	(388	)
	Initial valuation on date of issuance			(241	)		—
	Revaluation			(147	)		30
	Conversion of debt			—			358
	Balance, end of year		$	(388	)	$	—
	All of the Company’s derivative financial instruments amounts are classified on the consolidated balance sheets as other current liabilities and other liabilities, and none are designated for trading or speculative purposes.
	Other Fair Value Disclosures
	The fair value of the Company’s notes payable was determined based on a discounted cash flow analysis using Level 2 inputs based on quoted market prices for similar instruments that are not active. As of December 31, 2013, the carrying amount and fair value of the notes payable was $2.4 million (See Note 6 for further discussion). Upon closing of the IPO, the Company’s notes payable automatically converted into common stock.

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2014
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,
		2013			2014
	Equipment	$	5,035		$	7,748
	Software		8,947			19,574
	Furniture and fixtures		306			337
	Leasehold improvements		2,038			2,594
	Total property and equipment	$	16,326		$	30,253
	Accumulated depreciation and amortization		(5,513	)		(12,581	)
	Total property and equipment, net	$	10,813		$	17,672
	As of December 31, 2013, and December 31, 2014, the gross carrying amount of property and equipment includes computer equipment under capital leases with a cost basis of $1.4 million and $1.7 million, respectively. Accumulated depreciation related to this computer equipment was $0.2 million and $0.7 million as of December 31, 2013 and December 31, 2014, respectively. Interest expense for the years ended December 31, 2013 and December 31, 2014 was immaterial. As of December 31, 2013 and December 31, 2014, the total capital lease obligation was $1.3 million and $1.0 million, respectively, was recorded on the consolidated balance sheets as other current liabilities and other liabilities.
	Capitalized internal-use software costs are also included in property and equipment. During the years ended December 31, 2013 and 2014, the Company capitalized $6.3 million and $9.9 million of these software development costs, respectively. The net book value of capitalized internal use software was $6.4 million and $11.6 million as of December 31, 2013 and 2014, respectively. Amortization expense related to capitalized internal-use software was $0.5 million, $2.2 million and $4.6 million for the years ended December 31, 2012, 2013, and 2014, 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,
		2012			2013			2014
	Cost of revenue	$	541		$	1,492		$	3,078
	Sales and marketing		244			314			420
	Research and development		751			1,752			3,383
	General and administrative		63			208			317
	Total	$	1,599		$	3,766		$	7,198

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	6. Debt
	Line of Credit—Silicon Valley Bank
	In November 2010, the Company entered into a loan and security agreement with Silicon Valley Bank (“SVB”) that included a $3.0 million revolving line of credit. The original agreement contained certain affirmative covenants related to the timely delivery of financial information to SVB, as well as certain customary negative covenants. Amounts drawn on the revolving line of credit would bear interest at a floating rate of prime plus 1%.
	In August 2013, the Company renewed its revolving line of credit with SVB for two years, maturing August 2015, and increased the availability under its revolving line to $15.0 million. The amount of borrowings available under the agreement at any time may not exceed 80% of eligible accounts receivable at such time and any amounts borrowed are collateralized by substantially all of the Company’s assets. Amounts drawn on the revolving line of credit bear interest at a floating rate of either the LIBOR plus 200 basis points or the prime rate, at the Company’s election for each draw. The agreement contains certain affirmative covenants related to the timely delivery of financial information to SVB, as well as certain customary negative covenants. The agreement also includes a financial covenant related to the Company’s short-term liquidity. As of December 31, 2014, there were no amounts outstanding under the revolving line of credit, and the Company was in compliance with all financial and non-financial covenants.
	Convertible Note
	In March 2013, the Company signed a framework agreement for the provision of services to various operating entities with E.ON SE, one of its utility customers. Pursuant to the agreement, E.ON SE provided a $2.5 million loan to the Company and in return received a convertible note equal to the original principal amount of the loan. The note was scheduled to mature on March 8, 2016. Interest on the note accrued at a rate of 5% per annum compounding annually, and is due and payable with the principal amount at the earlier of (i) the time of conversion or (ii) the maturity date.
	The following table details the balances associated with the liability components of the notes payable balance as of December 31, 2013 (in thousands):
		December 31,
		2013
	Notes payable (face value)	$	2,500
	Accrued interest		102
	Unamortized note discount		(184	)
	Notes payable, net	$	2,418
	Upon the closing of the IPO, the Company’s convertible note automatically converted into 157,664 shares of common stock.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
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 and the United Kingdom. All leases are non-cancelable operating lease agreements that expire at various dates through 2016 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, 2014 is as follows (in thousands):
	Year Ending December 31,	Operating		Capital
		Leases		Leases
	2015	$	3,208	$	609
	2016		1,665		419
	2017		—		73
			4,873		1,101
	Less:
	Amounts representing interest		—		56
	Total lease obligations	$	4,873	$	1,045
	Rent expense under operating leases was $2.1 million, $3.0 million, and $4.4 million for the years ended December 31, 2012, 2013 and 2014, respectively.
	Letters of Credit
	As of December 31, 2013 and 2014, the Company had outstanding letters of credit totaling $1.1 million and $1.3 million, respectively, 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, 2014.
	Contingencies and Indemnifications
	In January 2013, the Company received notification from the United States Postal Service (“USPS”) that its energy efficiency reports will no longer be classified as Standard Mail per a review of the required conditions, and therefore subject to a higher postage rate. The Company appealed the USPS decision and was temporarily required to pay first class postage rates for its energy efficiency reports. In June 2013, the Company modified the format of its energy efficiency reports in order to meet the conditions required by the USPS to qualify for standard postage rates going forward.
	In the normal 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.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity	8. Stockholders’ Equity
	The Company had two classes of stock authorized as of December 31, 2013 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
	In connection with the IPO, the Company was authorized to issue 25.0 million shares of preferred stock. As of December 31, 2014, there are no preferred shares issued and outstanding.
	Common Stock
	The Company is authorized to issue 500.0 million shares of common stock. As of December 31, 2013 and December 31, 2014, there were 22.1 million and 50.4 million shares of common stock issued and outstanding, respectively. 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”. The following table summarizes the activity of the Company’s outstanding restricted stock for the years ended December 31, 2013 and 2014 (in thousands, expect per share amounts):
					Weighted-
					Average
		Restricted			Grant Date
		Shares			Fair Value
	Balance as of December 31, 2012		272		$	2.09
	Vested		(159	)		2.09
	Balance as of December 31, 2013		113		$	2.09
	Vested		(113	)		2.09
	Balance as of December 31, 2014		—
	In the event of a termination of services for any reason, any unvested shares of restricted stock were subject to a repurchase option by the Company at the original purchase price. The initial funds received for the restricted common stock were recorded as a liability and subsequently reclassified to equity over time as the restricted stock vests and they are released from the repurchase option. There is no outstanding repurchase option liability related to restricted stock as of December 31, 2014.
	Accumulated Other Comprehensive Income (Loss)
	Other comprehensive income (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 (deficit). The Company’s other comprehensive income 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.
	The following table summarizes the activity for each component of accumulated other comprehensive loss (in thousands):
		Foreign			Foreign			Accumulated
		currency			currency			other
		translation			derivative			comprehensive
					instruments			loss
	Balance as of December 31, 2011	$	(17	)	$	—		$	(17	)
	Other comprehensive income (loss)		51			(97	)		(46	)
	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	)
	Gains (losses) on cash flow hedges are recognized in the consolidated statements of operations in revenue—see Note 3 for further details.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
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, 2014, the total shares of common stock reserved for issuance was 21.4 million, 4.9 million of which were available for issuance.
	Stock Option Activity
	Stock option activity is summarized in the following table (in thousands, except time period and per share amounts):
			Options			Weighted-			Weighted-			Aggregate
			Outstanding			Average			Average			Intrinsic
						Exercise Price			Remaining			Value(1)
									Contractual Term
									(Years)
	Balance at December 31, 2013			7,790		$	3.83
	Granted			50			18
	Exercised			(1,559	)		2.1
	Forfeited			(466	)		4.07
	Balance at December 31, 2014			5,815		$	4.4			7.3		$	57,715
	Vested and expected to vest after December 31, 2014			5,678		$	4.31			7.3		$	56,830
	Exercisable at December 31, 2014			4,158		$	3.74			7		$	43,696
	-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, 2013 and December 31, 2014, unvested stock options subject to repurchase were 0.3 million and 0.2 million, respectively, at an aggregate exercise price of $0.9 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,
			2012			2013			2014
	Total fair value of stock options granted		$	2,491		$	20,919		$	435
	Total fair value of shares vested			1,172			2,427			6,238
	Total intrinsic value of stock options exercised			1,514			8,258			23,420
	Cash received from stock options exercised			629			2,797			3,285
	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
			December 31,
			2012			2013			2014
	Expected volatility			43	%		51	%		48	%
	Expected term (in years)			6			6			6
	Dividend yield			0	%		0	%		0	%
	Risk-free interest rate			1	%		1	%		2	%
	Non-Employee Stock Options
	In certain instances, the Company grants stock options to consultants or advisors in return for services provided. These options were granted under the 2007 Plan and are included in the option summary tables above.
	As of December 31, 2014, there were 0.1 million non-employee stock options outstanding at a weighted-average exercise price of $2.94. Of those outstanding non-employee options, 0.1 million were vested and exercisable.
	Restricted Stock Unit Activity
	A summary of restricted stock unit (“RSU”) activity for the year ended December 31, 2014 is summarized in the following table (in thousands, except per share amounts):
			RSUs			Weighted-			Weighted-			Aggregate
			Outstanding			Average			Average			Intrinsic
						Grant			Remaining			Value
						Date Fair			Contractual
						Value			Term
									(Years)
	Balance at December 31, 2013			1,093		$	15.48
	Granted			2,398			17.17
	Released			(351	)		16.01
	Forfeited			(302	)		16.23
	Balance at December 31, 2014			2,838		$	16.77			6.4		$	40,391
	Vested and expected to vest after December 31, 2014			2,488		$	16.75			6.4		$	35,411
	The number of RSUs granted to non-employee board members and consultants for each of the years ended December 31, 2013 and 2014 was less than 0.1 million.
	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,
			2012			2013			2014
	Cost of revenue		$	144		$	204		$	1,354
	Sales and marketing			527			1,487			8,932
	Research and development			468			960			5,623
	General and administrative			48			974			4,473
	Total		$	1,187		$	3,625		$	20,382
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, 2014 related to our non-vested stock options and RSU awards is presented below (in thousands, except per year information):
		As of December 31, 2014
		Unrecognized			Average Expected
		Expense			Recognition Period
		(in thousands)			(in years)
Restricted stock units		$	32,443			3.2
Stock options			13,363			2.7
		$	45,806
For the years ended December 31, 2013 and 2014, total capitalized stock-based compensation expense was $0.1 million and $1.2 million, respectively. For the year ended December 31, 2012, there was no capitalized stock-based compensation expense.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	10. Income Taxes
	For the years ended December 31, 2012, 2013 and 2014 the income tax provision for (benefit from) 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 rate for the years ended December 31, 2012, 2013 and 2014:
		Year Ended
		December 31,
		2012			2013			2014
	U.S. federal income tax rate		34	%		34	%		34	%
	State taxes		4	%		4	%		5	%
	Change in valuation allowance		(39	%)		(31	%)		(36	%)
	Changes in state tax rate		1	%		4	%		(1	%)
	Stock compensation		(3	%)		(4	%)		(1	%)
	Meals and entertainment		(1	%)		(2	%)		(1	%)
	Other, net		4	%		(5	%)		0	%
	Effective tax rate		0	%		0	%		0	%
	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, 2013 and 2014, are as follows (in thousands):
		December 31,
		2013			2014
	Deferred tax assets
	Accrued compensation and benefits	$	1,182		$	2,058
	Deferred rent liability		483			305
	Stock compensation		485			5,440
	Deferred income		1,017			1,043
	Net operating loss carryforward		23,081			34,414
	Other		14			37
	Total deferred tax assets		26,262			43,297
	Deferred tax liabilities
	Depreciation and amortization		1,854			3,649
	Other		63			—
	Total deferred tax liabilities		1,917			3,649
	Valuation allowance		(24,345	)		(39,652	)
	Net deferred tax assets (liabilities)	$	—		$	(4	)
	Opower had gross U.S. federal and state net operating loss carryforwards of approximately $58.3 million and $91.2 million as of December 31, 2013 and 2014, respectively. Approximately $4.2 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 $1.7 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 $24.3 million and $39.7 million, as of December 31, 2013 and 2014 respectively. The change in valuation allowance primarily relates to the 2014 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, 2014, 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 2007 to 2014.

Net_Income_Loss_Per_Share

Net Income (Loss) Per Share	12 Months Ended
	Dec. 31, 2014
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, 2012, 2013 and 2014 (in thousands, except per share amounts):
		Year Ended
		December 31,
		2012			2013			2014
	Numerator:
	Net loss	$	(12,332	)	$	(14,161	)	$	(41,751	)
	Non-cumulative dividends to preferred stockholders		—			—			—
	Net loss attributable to common stockholders	$	(12,332	)	$	(14,161	)	$	(41,751	)
	Denominator:
	Weighted-average common stock outstanding, basic		19,442			21,121			41,921
	Effect of potentially dilutive stock options and restricted stock units					—			—
	Weighted-average common stock outstanding, diluted		19,442			21,121			41,921
	Net loss per share, basic and diluted	$	(0.63	)	$	(0.67	)	$	(1.00	)
	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, 2012, 2013 and 2014 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):
		Year Ended
		December 31,
		2012			2013			2014
	Convertible preferred stock		19,247			19,247			—
	Stock options		6,982			7,790			5,815
	Restricted stock units		—			1,093			2,838
	Common stock subject to repurchase		272			408			154
			26,501			28,538			8,807
	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, 2014
Text Block [Abstract]
Geographic Information	12. Geographic Information
	For the years ended December 31, 2013 and 2014, approximately 90% and 86% of the Company’s revenue was generated by customers located in the United States, respectively. Substantially all of the Company’s long-lived assets currently reside in the United States.

Employee_Benefit_and_Retiremen

Employee Benefit and Retirement Plans	12 Months Ended
	Dec. 31, 2014
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 eligible employees of the Company. 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_Accou

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
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
		Balance			Operations			Deferred							Balance
								Revenue
	2012
	Allowance for doubtful accounts	$	—		$	—		$	—		$	—	$	—	$	—
	Deferred tax valuation allowance		(15,647	)		(4,297	)		—			—		—		(19,944	)
	2013
	Allowance for doubtful accounts	$	—		$	—		$	(361	)	$	—	$	—	$	(361	)
	Deferred tax valuation allowance		(19,944	)		(4,401	)		—			—		—		(24,345	)
	2014
	Allowance for doubtful accounts	$	(361	)	$	—		$	—		$	—	$	361	$	—
	Deferred tax valuation allowance		(24,345	)		(15,307	)		—			—		—		(39,652	)

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	15. Subsequent Events
	Effective January 2015, the Company entered into a lease agreement for space in San Francisco, California. The lease expires in 2018. Additionally, in January 2015, the Company leased space in Odessa, Ukraine. The lease expires in 2017. Aggregate future minimum lease payments for the San Francisco and Ukraine facilities are approximately $8.0 million and $0.3 million, respectively.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

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 updated its methodology for allocating certain general and administrative costs to more closely align these costs to the functional departments consuming the related services. As a result, certain prior period costs have been reclassified from general and administrative expenses to cost of revenue, sales and marketing expenses, and research and development expenses primarily based on the headcount in each of these functional areas. The reclassifications for the year ended December 31, 2012 reduced general and administrative expenses by $3.7 million and increased cost of revenue, sales and marketing expenses, and research and development expenses by $0.7 million, $1.1 million, and $1.9 million, respectively. The reclassifications for the year ended December 31, 2013 reduced general and administrative expenses by $5.8 million and increased cost of revenue, sales and marketing expenses, and research and development expenses by $0.8 million, $2.6 million and $2.4 million, respectively. These reclassifications had no effect on previously reported operating loss, net loss or cash flows.

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.

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 investments with original maturities of three months or less to be cash and cash equivalents.

Accounts Receivable

Accounts Receivable

Accounts receivable are derived from services to be delivered to utility providers and are stated at their net realizable value. Each month the Company reviews its receivables on a customer-by-customer 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 and accounts receivable. The Company maintains the majority of its cash and cash equivalents with one financial institution, 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 customers and maintains an allowance for doubtful accounts as deemed necessary. Collection efforts from long-established utilities have been historically successful, so the Company believes credit risk to be low.

The following table summarizes those customers who represented at least 10% of revenue or accounts receivable for the periods presented:

Revenue

Accounts Receivable

Year Ended

December 31,

December 31,

2012

2013

2014

2013

2014

Customer A

*

11

%

12

%

*

10

%

Customer B

15

%

14

%

10

%

*

*

Customer C

14

%

13

%

*

22

%

17

%

Customer D

*

*

*

12

%

*

Customer E

*

*

*

10

%

*

*

=xA0;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. 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 relates to a capitalized internal-use software project termination. During the year ended December 31, 2014, we recorded a non-cash asset impairment related to long-lived assets of $0.1 million. There was no impairment of long-lived assets during the year ended December 31, 2012.

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: Observable inputs. Quoted prices in active markets for identical assets and liabilities;

•

Level 2: Observable inputs other than the quoted price. Includes quoted prices for similar instruments, quoted prices for identical or similar instruments in inactive markets and amounts derived from valuation models where all significant inputs are observable in active markets; and

•

Level 3: Unobservable inputs. Includes amounts derived from valuation models where one or more significant inputs are unobservable and require the Company to develop relevant assumptions.

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 (see Note 6 for further details). 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 utility providers based on a service provided to those utilities, which includes analyzing data provided by the utilities and using that data to encourage utility customers to reduce energy consumption and improve satisfaction. The Company generates substantially all of its revenue from service contracts.

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 contracts is segregated into separate accounting units, the predominant units of which are data analysis and web tools, and recognized on a straight-line basis over the related service period for each accounting unit.

The Company recognizes revenues when the following criteria have been met:

•

Persuasive evidence of an arrangement exists: A signed contract or any other written documentation from the customer that confirms their explicit acceptance of a specific statement of work is deemed to represent persuasive evidence of an arrangement.

•

Delivery has occurred: For data analysis, delivery is considered to have occurred once a data connection with a utility has been configured and reports are being received by end-users. For web tools, delivery is considered to have occurred once the web service is live and accessible by end-users.

•

The price is fixed or determinable: The Company considers the contract price to be fixed or determinable once the fees are contractually agreed upon with the customer.

•

Collection is reasonably assured: Each customer is evaluated for creditworthiness both at the inception of their arrangement and periodically throughout the period of time over which payments are due. Collection is deemed reasonably assured if the Company expects that the customer has the intent and ability to pay all amounts due, as scheduled. If it is determined that collection is not reasonably assured, revenue is deferred and recognized only upon cash collection.

Revenue recognition for each contract corresponds directly with the service period. The revenue recognition start date begins when delivery has occurred, which occurs approximately seven months after a new customer contract is signed. Service may last from one to five 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 contracts.

The Company charges customers set-up fees at the initiation of new contracts. The set-up fees are deferred and recognized ratably over the expected customer relationship period. The corresponding set-up 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 amounts are fixed or determinable 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 customer is not recognized until the performance criteria are met or the customer’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 consists primarily of report printing and shipping costs, data analysis and communication costs, hosting costs, personnel costs related to software implementation and maintenance, the cost to train and support customers, the cost of licenses to access consolidated information about energy consumers, depreciation of fixed assets and amortization expense associated with capitalized software.

Sales and Marketing Costs

Sales and Marketing Costs

Advertising costs are expensed as incurred and relate to promotional materials for customers and general brand exposure. These costs amounted to $0.5 million, $0.5 million, and $1.9 million for the years ended December 31, 2012, 2013 and 2014, 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 customer 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: The expected volatility of the Company’s shares is estimated using the historical volatility of a peer group of public companies over the most recent period commensurate with the estimated expected term of the awards. The Company’s selected peer group includes public enterprise cloud-based application providers that focus on a particular industry and contain a marketing component within their service offering.

•

Expected term: For employee stock option awards, the Company uses an estimated term equal to the weighted period between the vesting period and the contract life of the option. This method is known as the simplified method and is utilized due to the Company’s relatively short history. For non-employees, the Company uses an expected term equal to the remaining contract term.

•

Dividend yield: The Company has not paid dividends and does not anticipate paying a cash dividend in the foreseeable future and, accordingly, uses an expected dividend yield of zero.

•

Risk-free interest rate: The Company bases the risk-free interest rate on the implied yield available on a U.S. Treasury note with a term equal to the estimated expected term of the awards.

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 (deficit) and are excluded from net loss. The Company’s other comprehensive income (loss) is comprised of foreign currency translation adjustments 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 has 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 July 2013, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists. This guidance states that a liability related to an unrecognized tax benefit should be offset against a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The new guidance is effective on a prospective basis for annual and interim periods beginning after December 15, 2013, but early adoption and retrospective application are permitted. The Company adopted the guidance effective January 1, 2014 and it did not have a material impact on its consolidated financial statements.

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360). The ASU raises the threshold for a disposal to qualify as discontinued operations and requires new disclosures for individually significant disposal transactions that do not meet the definition of a discontinued operation. Under the new standard, companies report discontinued operations when they have a disposal that represents a strategic shift that has or will have a major impact on operations or financial results. The ASU will be applied prospectively and is effective for annual periods, and interim periods within those years, beginning after December 15, 2014. The Company will adopt the guidance effective January 1, 2015 and does not currently expect it to have a material impact on its consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Revenue or Accounts Receivable Percentage of Major Customers	The following table summarizes those customers who represented at least 10% of revenue or accounts receivable for the periods presented:
			Revenue									Accounts Receivable
			Year Ended									December 31,
			December 31,
			2012			2013			2014			2013			2014
	Customer A			*			11	%		12	%		*			10	%
	Customer B			15	%		14	%		10	%		*			*
	Customer C			14	%		13	%		*			22	%		17	%
	Customer D			*			*			*			12	%		*
	Customer E			*			*			*			10	%		*
	*	=xA0;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, 2014
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, 2013 and December 31, 2014 (in thousands):
			December 31, 2013												December 31, 2014
			Fair Value			Level 1			Level 2			Level 3			Fair Value		Level 1		Level 2		Level 3
	Assets:
	Cash equivalents (1):
	Money market funds (2)		$	15,511		$	15,511		$	—		$	—		$	108,274	$	108,274	$	—	$	—
	Total		$	15,511		$	15,511		$	—		$	—		$	108,274	$	108,274	$	—	$	—
	Liabilities:
	Foreign currency derivative contracts		$	(41	)	$	—		$	(41	)	$	—		$	2	$	—	$	2	$	—
	Convertible debt derivative			(388	)		—			—			(388	)		—		—		—		—
	Total		$	(429	)	$	—		$	(41	)	$	(388	)	$	2	$	—	$	2	$	—
	(1)	Included in cash and cash equivalents on the condensed consolidated balance sheets.
	(2)	Money market funds associated with the Company’s overnight investment sweep account.
Reconciliation of Convertible Debt Derivative Instrument Measured at Fair Value	The following table presents a reconciliation of the convertible debt derivative instrument measured at fair value as of December 31, 2013 and December 31, 2014 using significant unobservable inputs, and the amount of loss recorded in the Company’s consolidated statements of operations as a result of changes in fair value (in thousands):
			Year Ended
			December 31,
			2013			2014
	Convertible debt derivative
	Balance, beginning of year		$	—		$	(388	)
	Initial valuation on date of issuance			(241	)		—
	Revaluation			(147	)		30
	Conversion of debt			—			358
	Balance, end of year		$	(388	)	$	—

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
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,
		2013			2014
	Equipment	$	5,035		$	7,748
	Software		8,947			19,574
	Furniture and fixtures		306			337
	Leasehold improvements		2,038			2,594
	Total property and equipment	$	16,326		$	30,253
	Accumulated depreciation and amortization		(5,513	)		(12,581	)
	Total property and equipment, net	$	10,813		$	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,
		2012			2013			2014
	Cost of revenue	$	541		$	1,492		$	3,078
	Sales and marketing		244			314			420
	Research and development		751			1,752			3,383
	General and administrative		63			208			317
	Total	$	1,599		$	3,766		$	7,198

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Balances Associated with Liability Components of Notes Payable	The following table details the balances associated with the liability components of the notes payable balance as of December 31, 2013 (in thousands):
		December 31,
		2013
	Notes payable (face value)	$	2,500
	Accrued interest		102
	Unamortized note discount		(184	)
	Notes payable, net	$	2,418

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Summary of Lease Commitments	A summary of lease commitments as of December 31, 2014 is as follows (in thousands):
	Year Ending December 31,	Operating		Capital
		Leases		Leases
	2015	$	3,208	$	609
	2016		1,665		419
	2017		—		73
			4,873		1,101
	Less:
	Amounts representing interest		—		56
	Total lease obligations	$	4,873	$	1,045

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Summary of Outstanding Restricted Stock	The following table summarizes the activity of the Company’s outstanding restricted stock for the years ended December 31, 2013 and 2014 (in thousands, expect per share amounts):
					Weighted-
					Average
		Restricted			Grant Date
		Shares			Fair Value
	Balance as of December 31, 2012		272		$	2.09
	Vested		(159	)		2.09
	Balance as of December 31, 2013		113		$	2.09
	Vested		(113	)		2.09
	Balance as of December 31, 2014		—
Summary of Accumulated Other Comprehensive Loss	The following table summarizes the activity for each component of accumulated other comprehensive loss (in thousands):
		Foreign			Foreign			Accumulated
		currency			currency			other
		translation			derivative			comprehensive
					instruments			loss
	Balance as of December 31, 2011	$	(17	)	$	—		$	(17	)
	Other comprehensive income (loss)		51			(97	)		(46	)
	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	)

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
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 time period and per share amounts):
			Options			Weighted-			Weighted-			Aggregate
			Outstanding			Average			Average			Intrinsic
						Exercise Price			Remaining			Value(1)
									Contractual Term
									(Years)
	Balance at December 31, 2013			7,790		$	3.83
	Granted			50			18
	Exercised			(1,559	)		2.1
	Forfeited			(466	)		4.07
	Balance at December 31, 2014			5,815		$	4.4			7.3		$	57,715
	Vested and expected to vest after December 31, 2014			5,678		$	4.31			7.3		$	56,830
	Exercisable at December 31, 2014			4,158		$	3.74			7		$	43,696
	-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,
			2012			2013			2014
	Total fair value of stock options granted		$	2,491		$	20,919		$	435
	Total fair value of shares vested			1,172			2,427			6,238
	Total intrinsic value of stock options exercised			1,514			8,258			23,420
	Cash received from stock options exercised			629			2,797			3,285
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
			December 31,
			2012			2013			2014
	Expected volatility			43	%		51	%		48	%
	Expected term (in years)			6			6			6
	Dividend yield			0	%		0	%		0	%
	Risk-free interest rate			1	%		1	%		2	%
Summary of Restricted Stock Unit Activity	A summary of restricted stock unit (“RSU”) activity for the year ended December 31, 2014 is summarized in the following table (in thousands, except per share amounts):
			RSUs			Weighted-			Weighted-			Aggregate
			Outstanding			Average			Average			Intrinsic
						Grant			Remaining			Value
						Date Fair			Contractual
						Value			Term
									(Years)
	Balance at December 31, 2013			1,093		$	15.48
	Granted			2,398			17.17
	Released			(351	)		16.01
	Forfeited			(302	)		16.23
	Balance at December 31, 2014			2,838		$	16.77			6.4		$	40,391
	Vested and expected to vest after December 31, 2014			2,488		$	16.75			6.4		$	35,411
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,
			2012			2013			2014
	Cost of revenue		$	144		$	204		$	1,354
	Sales and marketing			527			1,487			8,932
	Research and development			468			960			5,623
	General and administrative			48			974			4,473
	Total		$	1,187		$	3,625		$	20,382
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, 2014 related to our non-vested stock options and RSU awards is presented below (in thousands, except per year information):
			As of December 31, 2014
			Unrecognized			Average Expected
			Expense			Recognition Period
			(in thousands)			(in years)
	Restricted stock units		$	32,443			3.2
	Stock options			13,363			2.7
			$	45,806

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
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 rate for the years ended December 31, 2012, 2013 and 2014:
		Year Ended
		December 31,
		2012			2013			2014
	U.S. federal income tax rate		34	%		34	%		34	%
	State taxes		4	%		4	%		5	%
	Change in valuation allowance		(39	%)		(31	%)		(36	%)
	Changes in state tax rate		1	%		4	%		(1	%)
	Stock compensation		(3	%)		(4	%)		(1	%)
	Meals and entertainment		(1	%)		(2	%)		(1	%)
	Other, net		4	%		(5	%)		0	%
	Effective tax rate		0	%		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, 2013 and 2014, are as follows (in thousands):
		December 31,
		2013			2014
	Deferred tax assets
	Accrued compensation and benefits	$	1,182		$	2,058
	Deferred rent liability		483			305
	Stock compensation		485			5,440
	Deferred income		1,017			1,043
	Net operating loss carryforward		23,081			34,414
	Other		14			37
	Total deferred tax assets		26,262			43,297
	Deferred tax liabilities
	Depreciation and amortization		1,854			3,649
	Other		63			—
	Total deferred tax liabilities		1,917			3,649
	Valuation allowance		(24,345	)		(39,652	)
	Net deferred tax assets (liabilities)	$	—		$	(4	)

Net_Income_Loss_Per_Share_Tabl

Net Income (Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Summary of Calculation of Company's Basic and Diluted 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, 2012, 2013 and 2014 (in thousands, except per share amounts):
		Year Ended
		December 31,
		2012			2013			2014
	Numerator:
	Net loss	$	(12,332	)	$	(14,161	)	$	(41,751	)
	Non-cumulative dividends to preferred stockholders		—			—			—
	Net loss attributable to common stockholders	$	(12,332	)	$	(14,161	)	$	(41,751	)
	Denominator:
	Weighted-average common stock outstanding, basic		19,442			21,121			41,921
	Effect of potentially dilutive stock options and restricted stock units					—			—
	Weighted-average common stock outstanding, diluted		19,442			21,121			41,921
	Net loss per share, basic and diluted	$	(0.63	)	$	(0.67	)	$	(1.00	)
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):
		Year Ended
		December 31,
		2012			2013			2014
	Convertible preferred stock		19,247			19,247			—
	Stock options		6,982			7,790			5,815
	Restricted stock units		—			1,093			2,838
	Common stock subject to repurchase		272			408			154
			26,501			28,538			8,807

Valuation_and_Qualifying_Accou1

Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2014
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
		Balance			Operations			Deferred							Balance
								Revenue
	2012
	Allowance for doubtful accounts	$	—		$	—		$	—		$	—	$	—	$	—
	Deferred tax valuation allowance		(15,647	)		(4,297	)		—			—		—		(19,944	)
	2013
	Allowance for doubtful accounts	$	—		$	—		$	(361	)	$	—	$	—	$	(361	)
	Deferred tax valuation allowance		(19,944	)		(4,401	)		—			—		—		(24,345	)
	2014
	Allowance for doubtful accounts	$	(361	)	$	—		$	—		$	—	$	361	$	—
	Deferred tax valuation allowance		(24,345	)		(15,307	)		—			—		—		(39,652	)

Initial_Public_Offering_Additi

Initial Public Offering - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Subsidiary, Sale of Stock [Line Items]
Common stock, shares issued		50,372,000	22,113,000
Payment for stock issuance cost		$1,873,000	$273,000
Subordinated convertible promissory note automatically converted into shares of common stock	157,664
Offering expenses			800,000
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
Proceeds from issuance of common stock	121,800,000
Payment for stock issuance cost	2,100,000
Subordinated convertible promissory note automatically converted into shares of common stock	157,664
Reclassification to additional paid-in capital in connection with the IPO			$2,100,000
Convertible Promissory Note [Member]
Subsidiary, Sale of Stock [Line Items]
Number of preferred stock converted to common stock	19,246,714

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Segment
Schedule Of Significant Accounting Policies [Line Items]
General and administrative expense		$17,844,000	$7,816,000	$4,071,000
Sales and marketing expense		61,267,000	33,116,000	22,458,000
Research and development expense		45,999,000	29,496,000	18,006,000
Advertisement cost		1,900,000	500,000	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	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]
Threshold percentage of revenue and accounts receivable represented by major customers		10.00%
Service period for revenue recognition		5 years
Research and Development [Member]
Schedule Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets		100,000	600,000	0
Scenario, Adjustment [Member]
Schedule Of Significant Accounting Policies [Line Items]
General and administrative expense			5,800,000	3,700,000
Change in cost of revenue			800,000	700,000
Sales and marketing expense			2,600,000	1,100,000
Research and development expense			2,400,000	1,900,000
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]
Schedule Of Significant Accounting Policies [Line Items]
Threshold percentage of revenue and accounts receivable represented by major customers		10.00%
Revenue [Member]
Schedule Of Significant Accounting Policies [Line Items]
Threshold percentage of revenue and accounts receivable represented by major customers		10.00%

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Summary of Revenue or Accounts Receivable Percentage of Major Customers (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%
Revenue [Member] | Customer A [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	12.00%	11.00%
Revenue [Member] | Customer B [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%	14.00%	15.00%
Revenue [Member] | Customer C [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage		13.00%	14.00%
Accounts Receivable [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%
Accounts Receivable [Member] | Customer A [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%
Accounts Receivable [Member] | Customer C [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	17.00%	22.00%
Accounts Receivable [Member] | Customer D [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage		12.00%
Accounts Receivable [Member] | Customer E [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage		10.00%

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Summary of Revenue or Accounts Receivable Percentage of Major Customers (Parenthetical) (Detail) (Maximum [Member])	12 Months Ended
	Dec. 31, 2014
Maximum [Member]
Revenue or Accounts Receivable by Major Customers [Line Items]
Concentration percentage	10.00%

Summary_of_Significant_Account6

Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2014
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_Summar

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash equivalents
Money market funds	$108,274	$15,511
Total	108,274	15,511
Liabilities:
Convertible debt derivative		-388
Total	2	-429
Foreign Currency Derivative Contracts [Member]
Liabilities:
Foreign currency derivative contracts	2	-41
Fair Value, Inputs, Level 1 [Member]
Cash equivalents
Money market funds	108,274	15,511
Total	108,274	15,511
Fair Value, Inputs, Level 2 [Member]
Liabilities:
Total	2	-41
Fair Value, Inputs, Level 2 [Member] | Foreign Currency Derivative Contracts [Member]
Liabilities:
Foreign currency derivative contracts	2	-41
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Convertible debt derivative		-388
Total		($388)

Fair_Value_Measurements_Reconc

Fair Value Measurements - Reconciliation of Convertible Debt Derivative Instrument Measured at Fair Value (Detail) (Fair Value, Inputs, Level 3 [Member], Convertible Debt Derivative Instrument [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member] | Convertible Debt Derivative Instrument [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year	($388)
Initial valuation on date of issuance		-241
Revaluation	30	-147
Conversion of debt	358
Balance, end of year		($388)

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]
Notes payable, carrying value	$2,418

Property_and_Equipment_Schedul

Property and Equipment - Schedule of Property and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property and equipment	$30,253	$16,326
Accumulated depreciation and amortization	-12,581	-5,513
Total property and equipment, net	17,672	10,813
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	7,748	5,035
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	19,574	8,947
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	337	306
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$2,594	$2,038

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Capital lease obligations	$1,000,000	$1,300,000
Property and equipment	30,253,000	16,326,000
Accumulated depreciation	12,581,000	5,513,000
Capitalized internal-use software development costs	9,900,000	6,300,000
Capitalized internal-use software cost, net	11,600,000	6,400,000
Amortization expense related to capitalized internal-use software	4,600,000	2,200,000	500,000
Capital Lease Obligations [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	1,700,000	1,400,000
Accumulated depreciation	$700,000	$200,000

Property_and_Equipment_Breakou

Property and Equipment - Breakout of Depreciation and Amortization Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$7,198	$3,766	$1,599
Cost of Revenue [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	3,078	1,492	541
Sales and Marketing [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	420	314	244
Research and Development [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	3,383	1,752	751
General and Administrative [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$317	$208	$63

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended	1 Months Ended
	Apr. 30, 2014	Dec. 31, 2014	Aug. 31, 2013	Mar. 31, 2013	Nov. 30, 2010
Debt Instrument [Line Items]
Convertible note				$2,500,000
Convertible note automatically converted into shares of common stock	157,664
IPO [Member]
Debt Instrument [Line Items]
Convertible note automatically converted into shares of common stock	157,664
Convertible Note [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		8-Mar-16
Debt instrument, interest rate		5.00%
Debt instrument, payment description		Interest on the note accrued at a rate of 5% per annum compounding annually, and is due and payable with the principal amount at the earlier of (i) the time of conversion or (ii) the maturity date.
Line of Credit-Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Revolving line of credit			15,000,000		3,000,000
Revolving line of credit, maturity period			2 years
Revolving line of credit, maturity date		2015-08
Maximum borrowing capacity as percentage of accounts receivable			80.00%
Revolving line of credit, amount outstanding		0
Line of Credit-Silicon Valley Bank [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Revolving line of credit, interest rate description		Interest at a floating rate of prime plus 1%.
Revolving line of credit, basis spread		1.00%
Line of Credit-Silicon Valley Bank [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Revolving line of credit, interest rate description		Interest at a floating rate of either the LIBOR plus 200 basis points or the prime rate
Revolving line of credit, basis spread		2.00%

Debt_Balances_Associated_with_

Debt - Balances Associated with Liability Components of Notes Payable (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
Notes payable (face value)	$2,500
Accrued interest	102
Unamortized note discount	-184
Notes payable, net	$2,418

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Contingencies And Commitments [Line Items]
Operating lease agreement expire period		2016
Capital lease term	36 months
Weighted-average interest rate implicit in leases	5.50%
Rent expense under operating leases		$4.40	$3	$2.10
Total outstanding letters of credit		1.3	1.1
Arlington [Member]
Contingencies And Commitments [Line Items]
Total outstanding letters of credit		0.6
San Francisco [Member]
Contingencies And Commitments [Line Items]
Total outstanding letters of credit		$0.70

Commitments_and_Contingencies_2

Commitments and Contingencies - Summary of Lease Commitments (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Leases [Abstract]
Operating Leases, 2015	$3,208
Operating Leases, 2016	1,665
Operating Leases, 2017	0
Total lease obligations, Operating Leases	4,873
Capital Leases, 2015	609
Capital Leases, 2016	419
Capital Leases, 2017	73
Capital Leases, Gross	1,101
Less: Amounts representing interest	56
Total lease obligations, Capital Leases	$1,045

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Class_of_Stock	Class_of_Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of classes of stock	2	2
Preferred stock, shares authorized	25,000,000
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	50,372,000	22,113,000
Common stock, shares outstanding	50,372,000	22,113,000
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
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
Preferred stock, shares outstanding	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]
Outstanding repurchase option liability	0

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Outstanding Restricted Stock (Detail) (Restricted Stock [Member], USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares, Beginning balance	113	272
Restricted Shares, Vested	-113	-159
Restricted Shares, Ending Balance		113
Weighted-Average Grant Date Fair Value, Beginning Balance	$2.09	$2.09
Weighted-Average Grant Date Fair Value, Vested	$2.09	$2.09
Weighted-Average Grant Date Fair Value, Ending Balance		$2.09

Stockholders_Equity_Summary_of1

Stockholders' Equity - Summary of Accumulated Other Comprehensive Loss (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Foreign currency translation, Beginning balance	($6)	$34	($17)
Foreign currency translation, Other comprehensive income (loss) before reclassifications	-236	-40
Foreign currency translation, Reclassifications to net income	0	0	0
Foreign currency translation, Other comprehensive income (loss)	-236	-40	51
Foreign currency translation, Ending balance	-242	-6	34
Foreign currency derivative instruments, Beginning balance	-114	-97
Foreign currency derivative instruments, Other comprehensive income (loss) before reclassifications	-18	-28
Foreign currency derivative instruments, Reclassifications to net income	76	11
Foreign currency derivative instruments, Other comprehensive income (loss)	58	-17	-97
Foreign currency derivative instruments, Ending balance	-56	-114	-97
Accumulated other comprehensive loss, Beginning balance	-120	-63	-17
Accumulated other comprehensive loss, Other comprehensive income (loss) before reclassifications	-254	-68
Accumulated other comprehensive loss, Reclassifications to net income	76	11
Total other comprehensive loss	-178	-57	-46
Accumulated other comprehensive loss, Ending balance	($298)	($120)	($63)

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity awards vesting period	4 years
Shares of common stock reserved for issuance	21,400,000
Shares available for issuance	4,900,000
Options Outstanding	50,000
Weighted-average exercise price of options	$18
Capitalized stock-based compensation expense	$1,221,000	$121,000	$0
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity awards expire period	7 years
Number of RSUs granted, value	2,398,000
Restricted Stock Units [Member] | Nonemployee Board Members and Consultants [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs granted, value	100,000	100,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity awards expire period	10 years
2007 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options subject to repurchase	200,000	300,000
Aggregate exercise price	$400,000	$900,000
2007 Stock Plan [Member] | Non Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	100,000
Weighted-average exercise price of options	$2.94
Options vested and exercisable	100,000

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding, Beginning Balance	7,790
Options Outstanding, Granted	50
Options Outstanding, Exercised	-1,559
Options Outstanding, Forfeited	-466
Options Outstanding, Ending Balance	5,815
Options Outstanding, Vested and expected to vest Ending Balance	5,678
Options Outstanding, Exercisable Ending Balance	4,158
Weighted-Average Exercise Price, Beginning Balance	$3.83
Weighted-Average Exercise Price, Granted	$18
Weighted-Average Exercise Price, Exercised	$2.10
Weighted-Average Exercise Price, Forfeited	$4.07
Weighted-Average Exercise Price, Ending Balance	$4.40
Weighted-Average Exercise Price, Vested and expected to vest Ending Balance	$4.31
Weighted-Average Exercise Price, Exercisable Ending Balance	$3.74
Weighted-Average Remaining Contractual Term	7 years 3 months 18 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest	7 years 3 months 18 days
Weighted-Average Remaining Contractual Term, Exercisable	7 years
Aggregate Intrinsic Value	$57,715
Aggregate Intrinsic Value, Vested or expected to vest Ending Balance	56,830
Aggregate Intrinsic Value, Exercisable Ending Balance	$43,696

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Additional Information on Stock Option Granted, Vested and Exercised (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total fair value of stock options granted	$435	$20,919	$2,491
Total fair value of shares vested	6,238	2,427	1,172
Total intrinsic value of stock options exercised	23,420	8,258	1,514
Cash received from stock options exercised	$3,285	$2,797	$629

StockBased_Compensation_Weight

Stock-Based Compensation - Weighted-Average Assumptions to Estimate Fair Value of Employee Stock Options (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected volatility	48.00%	51.00%	43.00%
Expected term (in years)	6 years	6 years	6 years
Dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	2.00%	1.00%	1.00%

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic Value	$57,715
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs Outstanding, Beginning balance	1,093,000
RSUs Outstanding, Granted	2,398,000
RSUs Outstanding, Released	-351,000
RSUs Outstanding, Forfeited	-302,000
RSUs Outstanding, Ending balance	2,838,000
RSUs Outstanding, Vested and expected to vest after December 31, 2014	2,488,000
Weighted-Average Grant Date Fair Value, Beginning balance	$15.48
Weighted-Average Grant Date Fair Value, Granted	$17.17
Weighted-Average Grant Date Fair Value, Released	$16.01
Weighted-Average Grant Date Fair Value, Forfeited	$16.23
Weighted-Average Grant Date Fair Value, Ending balance	$16.77
Weighted-Average Grant Date Fair Value, Vested and expected to vest after December 31, 2014	$16.75
Weighted-Average Remaining Contractual Term (Years)	6 years 4 months 24 days
Weighted-Average Remaining Contractual Term (Years), Vested and expected to vest after December 31, 2014	6 years 4 months 24 days
Aggregate Intrinsic Value	40,391
Aggregate Intrinsic Value, Vested and expected to vest after December 31, 2014	$35,411

StockBased_Compensation_StockB

Stock-Based Compensation - Stock-Based Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$20,382	$3,625	$1,187
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	1,354	204	144
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	8,932	1,487	527
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	5,623	960	468
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$4,473	$974	$48

StockBased_Compensation_Summar3

Stock-Based Compensation - Summary of Unrecognized Compensation Expense, Net of Estimated Forfeitures and Weighted Average Remaining Amortization Period (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$45,806
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	32,443
Average Expected Recognition Period	3 years 2 months 12 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense	$13,363
Average Expected Recognition Period	2 years 8 months 12 days

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. federal income tax rate	34.00%	34.00%	34.00%
State taxes	5.00%	4.00%	4.00%
Change in valuation allowance	-36.00%	-31.00%	-39.00%
Changes in state tax rate	-1.00%	4.00%	1.00%
Stock compensation	-1.00%	-4.00%	-3.00%
Meals and entertainment	-1.00%	-2.00%	-1.00%
Other, net	0.00%	-5.00%	4.00%
Effective tax rate	0.00%	0.00%	0.00%

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Tax Assets and Liabilities and Related Valuation Allowance (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets
Accrued compensation and benefits	$2,058	$1,182
Deferred rent liability	305	483
Stock compensation	5,440	485
Deferred income	1,043	1,017
Net operating loss carryforward	34,414	23,081
Other	37	14
Total deferred tax assets	43,297	26,262
Deferred tax liabilities
Depreciation and amortization	3,649	1,854
Other		63
Total deferred tax liabilities	3,649	1,917
Valuation allowance	-39,652	-24,345
Net deferred tax assets (liabilities)	($4)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards not recognized	$4,200,000
Operating loss carryforwards, limitations on use	The Companybs net operating loss carryforwards may be used to offset future taxable income and thereby reduce the Companybs U.S. Federal and state income taxes otherwise payable. Section 382 of the Internal Revenue Code of 1986, as amended, (bSection 382b) 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 Companybs stockholder base, the Companybs 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	39,652,000	24,345,000
Unrecognized tax benefits	0
U.S Federal and State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	91,200,000	58,300,000
Net operating loss carryforwards expiration period	2027
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	$1,700,000

Net_Income_Loss_Per_Share_Summ

Net Income (Loss) Per Share - Summary of Calculation of Company's Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net loss	($41,751)	($14,161)	($12,332)
Non-cumulative dividends to preferred stockholders	0	0	0
Net loss attributable to common stockholders	($41,751)	($14,161)	($12,332)
Denominator:
Weighted-average common stock outstanding, basic	41,921	21,121	19,442
Effect of potentially dilutive stock options and restricted stock units	0	0	0
Weighted-average common stock outstanding, diluted	41,921	21,121	19,442
Net loss per share, basic and diluted	($1)	($0.67)	($0.63)

Net_Income_Loss_Per_Share_Summ1

Net Income (Loss) Per Share - Summary of Potential Shares Excluded from Calculation of Diluted Net Loss Per Share (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	8,807	28,538	26,501
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share		19,247	19,247
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	5,815	7,790	6,982
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	2,838	1,093
Common Stock Subject to Repurchase [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	154	408	272

Geographic_Information_Additio

Geographic Information - Additional Information (Detail) (Revenue [Member])	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Revenue concentration percentage	10.00%
United States [Member]
Concentration Risk [Line Items]
Revenue concentration percentage	86.00%	90.00%

Employee_Benefit_and_Retiremen1

Employee Benefit and Retirement Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
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_Accou2

Valuation and Qualifying Accounts - Changes in Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	($361)
Additions, Charged to Deferred Revenue		-361
Write-offs	0	0	0
Deductions	361
Ending Balance		-361
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	-24,345	-19,944	-15,647
Additions, Charged to Operations	-15,307	-4,401	-4,297
Write-offs	0	0	0
Ending Balance	($39,652)	($24,345)	($19,944)

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	1 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Aggregate future minimum lease payments		$4,873
San Francisco, California [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Lease expiry period	2018
Aggregate future minimum lease payments	8,000
Ukraine [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Lease expiry period	2017
Aggregate future minimum lease payments	$300