Net loss per share attributable to common stockholders (Tables)

6 Months Ended

Jun. 30, 2017

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,
	2017			2016			2017			2016
	(in thousands)
Numerator:
Net loss attributable to common stockholders, basic and diluted	$	(8,017	)	$	(7,266	)	$	(14,897	)	$	(17,250	)
Denominator:
Weighted average common stock, basic and diluted	39,286			37,944			38,997			37,749
Net loss per share attributable to common stockholders:
Basic and diluted	$	(0.20	)	$	(0.19	)	$	(0.38	)	$	(0.46	)