Net (loss) income per share attributable to common stockholders (Tables)

12 Months Ended

Dec. 31, 2014

Net (loss) income per share attributable to common stockholders

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

	Years ended December 31,
	2014			2013			2012
	(in thousands)
Numerator:
Net (loss) income attributable to common stockholders, basic and diluted	$	(19,521	)	$	(3,968	)	$	7,295
Denominator:
Weighted average common stock, basic		35,753			35,578			34,774
Effect of dilutive stock options		—			—			2,543
Weighted average common stock, diluted		35,753			35,578			37,317
Net (loss) income per share attributable to common stockholders:
Basic	$	(0.55	)	$	(0.11	)	$	0.21
Diluted	$	(0.55	)	$	(0.11	)	$	0.20