Basic and Diluted Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Summary of Calculation of Basic and Diluted Net Loss per Share

The following table summarizes the Company’s calculation of basic and diluted net loss per share (in thousands, except share and per share amounts):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Numerator
Net loss	$	(34,918	)	$	(39,677	)	$	(106,754	)	$	(117,275	)
Denominator
Weighted-average number of common shares used in net loss per share calculation	80,297,757			78,866,597			80,017,436			74,716,970
Less: Weighted-average shares subject to repurchase	—			—			—			(686		)
Denominator: basic and diluted	80,297,757			78,866,597			80,017,436			74,716,284
Net loss per share, basic and diluted	$	(0.43	)	$	(0.50	)	$	(1.33	)	$	(1.57	)

Outstanding Shares of Potentially Dilutive Securities Excluded from Calculation of Diluted Net Loss per Share

The following outstanding shares of potentially dilutive securities were excluded from the calculation of diluted net loss per share for the three and nine months ended September 30, 2015 and 2014, as their effect was anti-dilutive:

	September 30,
	2015	2014
Options to purchase common stock	10,252,607	11,363,128
Restricted stock units	1,525,736	2,028,289
Warrants to purchase common stock	1,250,000	1,250,000
Shares of common stock to be issued upon conversion of convertible debt ("Notes")	18,790,996	18,790,996
Total	31,819,339	33,432,413