Income (loss) per share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Schedule of the computation of basic and diluted net income (loss) per share

The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts):

	Three months ended September 30,						Nine months ended September 30,
	2012			2011			2012			2011
Numerator:
Net income (loss)	$	1,737		$	(900	)	$	2,082		$	(2,242	)
Less: undistributed earnings attributable to participating securities	(9		)	—			(1,299		)	—
Net income (loss) attributable to common stockholders	1,728			(900		)	783			(2,242		)
Reallocation of undistributed earnings attributable to participating securities	1			—			26			—
Net income (loss) attributable to common stockholders for diluted net income (loss) per share	$	1,729		$	(900	)	$	809		$	(2,242	)
Denominator:
Weighted-average shares used to compute basic net income (loss) per common share	22,450			3,589			15,973			3,284
Effect of potentially dilutive securities:
Employee stock options and restricted stock units	2,818			—			2,688			—
Stock warrants	69			—			90			—
Weighted average shares used to compute diluted income (loss) per common share	25,337			3,589			18,751			3,284
Net income (loss) per share
Net income (loss) per common share - basic	$	0.08		$	(0.25	)	$	0.05		$	(0.68	)
Net income (loss) per common share - diluted	$	0.07		$	(0.25	)	$	0.04		$	(0.68	)

Schedule of antidilutive securities excluded from computation of earnings per share

The following securities were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:

	Three months ended September 30,		Nine months ended September 30,
(in thousands)	2012	2011	2012	2011
Convertible preferred stock (on an if converted basis)	—	12,917	—	12,917
Options to purchase common stock	405	3,475	339	3,475
Common stock subject to repurchase	—	200	—	200
Warrants to purchase convertible preferred stock	—	213	—	213
Restricted stock units	1	—	27	—