Net Loss Per Share - Schedule of Net Loss Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net loss	$ (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)