Basic and Diluted Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31,
	2013			2012
Numerator
Net loss	$	(26,525	)	$	(16,780	)
Denominator
Weighted-average number of common shares used in net loss per share calculation		61,572,119			60,188,428
Less: Weighted-average shares subject to repurchase		(29,610	)		(87,252	)
Denominator: basic and diluted		61,542,509			60,101,176
Net loss per share, basic and diluted	$	(0.43	)	$	(0.28	)

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 periods presented as the effect was anti-dilutive:

	Three Months Ended March 31,
	2013		2012
Options to purchase common stock		10,637,489		9,418,532
Common stock subject to repurchase		24,151		75,136
Restricted stock units		955,310		162,668
Warrants to purchase common stock		1,500,000		1,000,000
Shares of common stock to be issued upon conversion of the Notes		15,140,500		—
Total		28,257,450		10,656,336