Net Loss Per Share - Computation of Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (20,081)	$ (7,830)
Denominator:
Weighted-average common shares outstanding, basic and diluted (in shares)	24,906,932	20,442,626
Net loss per common share, basic and diluted (in dollars per share)	$ (0.81)	$ (0.38)