Net loss per share attributable to common stockholders (Tables)

3 Months Ended

Mar. 31, 2015

Net loss per share attributable to common stockholders

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

	Three Months Ended March 31,
	2015			2014
	(in thousands)
Numerator:
Net loss attributable to common stockholders, basic and diluted	$	(7,882	)	$	(5,448	)
Denominator:
Weighted average common stock, basic and diluted	36,390			35,350
Net loss per share attributable to common stockholders:
Basic	$	(0.22	)	$	(0.15	)
Diluted	$	(0.22	)	$	(0.15	)