Basic and Diluted Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Computation of Company's Basic and Diluted Net Loss Per Share of Common Stock

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

	ThreeMonthsEnded September30,						Nine Months Ended September30,
	2013			2012			2013			2012
Numerator
Net loss	$	(8,852	)	$	(9,568	)	$	(32,732	)	$	(28,307	)
Denominator
Weighted-average common shares for basic and diluted net loss per share		24,452			22,372			23,290			22,273
Basic and diluted net loss per share	$	(0.36	)	$	(0.43	)	$	(1.41	)	$	(1.27	)

Potential Shares of Common Stock Excluded from Diluted Weighted-Average Common Shares Outstanding

The following table sets forth the potential shares of common stock that were excluded from diluted weighted-average common shares outstanding (in thousands):

	ThreeMonthsEnded September30,			NineMonthsEnded September30,
		2013	2012		2013	2012
Shares of common stock issuable upon conversion of preferred stock		—	27,272		—	27,272
Shares of common stock issuable upon conversion of warrants		502	337		502	337
Shares of common stock subject to repurchase		49	110		49	110
Shares of common stock issuable under stock option plans outstanding		11,085	8,726		11,085	8,726
Potential common shares excluded from diluted net loss per share		11,636	36,445		11,636	36,445