Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Summary of Significant Accounting Policies [Abstract]

Calculation of weighted average shares of common stock used in the computations of basic and diluted income (loss) per share amounts

The following table presents the calculation of weighted average shares of common stock used in the computations of basic and diluted income (loss) per share amounts presented in the accompanying condensed consolidated statements of operations (in thousands, except per share amounts):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2012			2011		2012			2011
Net income (loss) attributed to common stockholders	$	(12,622	)	$	8,183	$	(43,757	)	$	(19,119	)
Basic:
Weighted average common shares used in computing basic net income (loss) per common share		33,369			30,440		31,569			30,329
Basic income (loss) per common share	$	(0.38	)	$	0.27	$	(1.39	)	$	(0.63	)
Diluted:
Weighted average common shares used in computing basic net income (loss) per common share		33,369			30,440		31,569			30,329
Add: Weighted average stock options		—			1,158		—			—
Add: Weighted average warrants		—			13		—			—
Add: Weighted average ESPP		—			—		—			—
Add: Weighted average RSUs with time-based vesting		—			—		—			—
Weighted average common shares used in computing diluted net income (loss) per common share		33,369			31,611		31,569			30,329
Diluted income (loss) per common share	$	(0.38	)	$	0.26	$	(1.39	)	$	(0.63	)

Schedule of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss Per Share

The following outstanding common stock options, RSUs with time-based vesting, common stock issuable pursuant to our ESPP and warrants to purchase common stock were excluded from the computation of diluted net loss per share for the periods presented because including them would have had an anti-dilutive effect. The RSUs with performance-based vesting were also excluded from the computation of diluted net loss per share because they were contingently issuable shares (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Options to purchase common stock		4,980		1,570		4,980		4,386
RSUs with time-based vesting		293		142		293		156
Common stock issuable pursuant to the ESPP		54		—		54		35
Warrants to purchase common stock		27		—		27		27
RSUs with performance-based vesting		35		39		35		39