Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Schedule of net loss per share, basic and diluted

	Three Months Ended March 31,
	2017			2016
Net loss (in thousands)	$	(11,422	)	$	(11,937	)
Weighted average common shares outstanding, basic and diluted		18,772,965			18,050,597
Net loss per share attributable to common stockholders	$	(0.61	)	$	(0.66	)

Schedule of potentially dilutive securities excluded from the computation of diluted net loss per share attributable to common stockholders

	March 31,
	2017		2016
Stock options to purchase common stock		1,701,131		2,200,117
Warrants for the purchase of common stock		47,710		47,710
		1,748,841		2,247,827