Net Loss Per Share

12 Months Ended

Dec. 31, 2011

Net Loss Per Share [Abstract]

Net Loss Per Share

5. Net Loss Per Share

Basic net loss per common share is calculated by dividing net loss by the weighted average number of common stock outstanding during the reporting period. For the years ended December 31, 2011, 2010 and 2009, basic and diluted net loss per share, are identical because the Company had losses from continuing operations and the impact of common equivalent shares would have been anti-dilutive and therefore excluded. For the year ended December 31, 2011, unvested restricted stock awards granted during the third quarter of fiscal 2011 are included in the calculation of basic weighted average shares because such shares are participating securities.

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

	Years Ended December 31,
	2011			2010			2009
Numerator:
Net loss attributable to common stockholders	$	(52,550	)	$	(19,453	)	$	(26,188	)
Denominator:
Weighted-average shares used to compute basic and diluted net loss per common share		45,546			29,778			4,040
Basic and diluted net loss per common share	$	(1.15	)	$	(0.65	)	$	(6.48	)

As the Company incurred net losses in the periods presented, the following table displays the Company's other outstanding common stock equivalents that were excluded from the computation of diluted net loss per share, as the effect of including them would have been antidilutive (in thousands):

	As of December 31,
	2011		2010		2009
Stock options		1,661		735		678
Restricted stock units		1,775		3,426		4,537
Employee stock purchase plan		579		1,000		—
Common stock warrants		23		65		11
Convertible preferred stock		—		—		28,044
Convertible preferred stock warrants		—		—		58