Net loss per share attributable to common stockholders (Tables)

6 Months Ended

Jun. 30, 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 June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Numerator:
Net loss attributable to common stockholders, basic and diluted	$	(5,937	)	$	(3,734	)	$	(13,819	)	$	(9,182	)
Denominator:
Weighted average common stock, basic and diluted	36,724			35,621			36,558			35,486
Net loss per share attributable to common stockholders:
Basic and diluted	$	(0.16	)	$	(0.10	)	$	(0.38	)	$	(0.26	)