Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Share

The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data):

	Year Ended December 31,
	2015			2014			2013
Numerator:
Net loss	$	(34,853	)	$	(56,153	)	$	(75,371	)
Denominator:
Weighted-average common shares outstanding	75,365			71,251			67,858
Less: Weighted-average unvested common shares subject to repurchase or forfeiture	148			500			477
Weighted-average shares used to compute net loss per share, basic and diluted	75,217			70,751			67,381
Net loss per share, basic and diluted	$	(0.46	)	$	(0.79	)	$	(1.12	)

Summary of Potentially Dilutive Securities that are not Included in Diluted Per Share

Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows:

	Year Ended December 31,
	2015	2014	2013
Shares subject to outstanding common stock options	6,976,957	7,329,575	9,480,138
Unvested restricted common stock	4,498,292	4,043,912	4,796,112
Common stock subject to repurchase	—	313,412	635,928
Purchase rights from employee stock purchase plans	8,268	—	—
	11,483,517	11,686,899	14,912,178