Net Income (Loss) per Share Attributable to Common Stockholders

6 Months Ended

Jun. 30, 2013

Net Income (Loss) per Share Attributable to Common Stockholders

10. Net Income (Loss) per Share Attributable to Common Stockholders

The following outstanding shares of common stock equivalents were excluded from the computation of diluted net income (loss) per share attributable to common stockholders for the periods presented because including them would have been antidilutive:

	ThreeMonthsEndedJune30,				SixMonthsEndedJune30,
	2013		2012			2013		2012
Convertible preferred stock		—		24,026,797			—		24,026,797
Common stock subject to repurchase		875		—			875		—
Stock options to purchase common stock		3,787,915		1,678,800			3,787,915		1,540,613
Preferred stock warrants		—		81,075			—		81,075
Common stock warrants		82,575		1,500			82,575		1,500

The following table sets forth the computation of our unaudited basic and diluted net income (loss) per share attributable to common stockholders (in thousands, except share and per share data):

	ThreeMonthsEndedJune30,								SixMonthsEndedJune30,
	2013				2012				2013				2012
Net income (loss)	$	(21,598	)	$		49,762		$		(39,741	)	$		36,636
Noncumulative dividends on convertible preferred stock		—				(6,332	)			—				(12,664	)
Undistributed earnings allocated to participating securities		—				(41,111	)			—				(22,715	)
Net income (loss) attributable to common stockholders, basic		(21,598	)			2,319				(39,741	)			1,257
Adjustment to undistributed earnings allocated to participating securities		—				995				—				559
Net income (loss) attributable to common stockholders, diluted	$	(21,598	)	$		3,314		$		(39,741	)	$		1,816
Basic shares:
Weighted average common shares outstanding		14,681,570				1,355,934				8,078,308				1,329,133
Diluted shares:
Weighted average common shares outstanding		14,681,570				1,355,934				8,078,308				1,329,133
Weighted average effect of dilutive stock options		—				629,710				—				639,688
		14,681,570				1,985,644				8,078,308				1,968,821
Net income (loss) per share attributable to common stockholders:
Basic	$	(1.47	)	$		1.71		$		(4.92	)	$		0.95
Diluted	$	(1.47	)	$		1.67		$		(4.92	)	$		0.92