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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of reconciliation of liabilities measured at fair value

The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the year ended December 31, 2015 (in thousands):

	Common Stock Warrant Liabilities
Balance at December 31, 2013	$	—
Issuance	11,280
Changes in fair value	(2,578		)
Balance at December 31, 2014	8,702
Issuance	—
Changes in fair value	(8,015		)
Balance at December 31, 2015	$	687

Summary of assumptions used to compute share-based compensation costs for stock options granted

The assumptions used to compute the share-based compensation costs for the stock options granted during the years ended December 31, 2015, 2014 and 2013 are as follows:

	Year Ended December 31,
	2015			2014			2013
Risk-free interest rate	1.6-1.8%			1.8-1.9%			1.1-1.8%
Expected dividend yield	—			—			—
Weighted average expected life (years)	5.4-5.5			5.4-5.5			5.3-5.5
Volatility	59-68%			60-71%			75-76%

Summary of compensation cost for stock-based compensation arrangements

The compensation cost that has been included in the Company’s consolidated statement of operations for all stock-based compensation arrangements is detailed as follows (in thousands):

	Year Ended December 31,
	2015				2014				2013
Cost of revenues	$	72			$	274			$	228
Research and development	286				2,080				719
Sales and marketing	359				470				459
General and administrative	1,926				1,730				2,672
Total	$	2,643			$	4,554			$	4,078

Schedule of diluted earning per share

For purposes of this calculation, common stock subject to repurchase by the Company, options and warrants are considered to be common stock equivalents and are only included in the calculation of diluted earnings per share when their effect is dilutive. The following table sets forth the computation of basic and diluted loss per share (in thousands, except per share data):

	Year Ended December 31,
	2015				2014				2013
Numerator:
Net loss for basic earnings per share	$	(178,676	)		$	(12,882	)		$	(82,227	)
Decrease in fair value of warrants	—				(2,578		)		—
Diluted net loss attributable to common stockholders	$	(178,676	)		$	(15,460	)		$	(82,227	)
Denominator:
Weighted average common shares outstanding	100,385				98,138				97,111
Weighted average unvested common shares subject to repurchase	(811		)		(791		)		(876		)
Weighted average common shares outstanding—basic	99,574				97,347				96,235
Effect of dilutive securities:
Conversion of preferred stock	—				—				—
Options	—				—				—
Warrants	—				388				—
Weighted average common shares outstanding—diluted	99,574				97,735				96,235
Net loss per share:
Basic	$	(1.79	)		$	(0.13	)		$	(0.85	)
Diluted	$	(1.79	)		$	(0.16	)		$	(0.85	)

Weighted-average anti-dilutive securities not included in diluted net loss per share

The anti-dilutive securities not included in diluted net loss per share were as follows (in thousands):

	Year Ended December 31,
	2015			2014			2013
Options to purchase common stock	7,941			7,057			4,597
Warrants to purchase common stock	11,544			725			594
Unvested restricted stock awards	811			791			876
	20,296			8,573			6,067

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Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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