Net income per share attributable to common stockholders (Tables)

3 Months Ended

Mar. 31, 2013

Net income per share attributable to common stockholders

Schedule of computation of basic and diluted net income per share attributable to common stockholders

	Three Months Ended March 31,
	2013			2012
	(in thousands)
Numerator:
Net (loss) income attributable to common stockholders, basic and diluted	$	(1,121	)	$	1,657
Denominator:
Weighted average common stock, basic	35,597			33,969
Dilutive effect of stock-based awards	—			2,663
Weighted average common stock, dilutive	35,597			36,632
Net (loss) income per share attributable to common stockholders:
Basic	$	(0.03	)	$	0.05
Diluted	$	(0.03	)	$	0.05