Net Income (Loss) Per Share Attributable to Common Stockholders

9 Months Ended

Sep. 30, 2012

Net Income (Loss) Per Share Attributable to Common Stockholders [Abstract]

Net Income (Loss) Per Share Attributable to Common Stockholders

(6) Net Income (Loss) Per Share Attributable to Common Stockholders

The following tables present the calculation of basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except share and per share data):

	Three Months Ended  September 30,						Nine Months Ended  September 30,
	2012			2011			2012			2011
Numerator:
Net income (loss)	$	(13,053	)	$	121		$	(27,417	)	$	5,148
Accretion of redeemable convertible preferred stock		0			(157	)		(308	)		(471	)
Net income attributable to participating securities		—			—			—			(3,788	)
Net income (loss) attributable to common stockholders - Basic	$	(13,053	)	$	(36	)	$	(27,725	)	$	889
Undistributed earnings reallocated to participating securities	$	—		$	26		$	—		$	361
Net income (loss) attributable to common stockholders - Diluted	$	(13,053	)	$	(10	)	$	(27,725	)	$	1,250
Denominator:
Weighted-average shares outstanding - Basic		117,698,005			20,693,359			57,089,411			19,695,440
Effect of potentially dilutive securities:
Common stock options		—			11,433,176			—			10,917,099
Weighted-average shares outstanding - Diluted		117,698,005			32,126,535			57,089,411			30,612,539
Net income (loss) per share attributable to common stockholders:
Basic	$	(0.11	)	$	—		$	(0.49	)	$	0.05
Diluted	$	(0.11	)	$	—		$	(0.49	)	$	0.04

Potentially dilutive securities not included in the calculation of diluted net income (loss) per share because doing so would be antidilutive are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Common stock options		37,279,442		14,246,439		37,279,442		8,548,888
Convertible preferred stock		—		83,703,016		—		83,703,016
Restricted stock units		1,134,851		—		1,134,851		—
Common stock subject to repurchase		349,165		524,167		349,165		288,350
ESPP obligations		468,704		—		468,704		—
Total potentially dilutive securities		39,232,162		98,473,622		39,232,162		92,540,254