Net Loss per Share - Computation of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator
Net loss	$ (67,455)	$ (48,939)
Denominator
Weighted-average number of common shares used in net loss per share—basic	36,203,631	33,222,085
Dilutive potential common shares	0	0
Weighted-average number of common shares used in net loss per share—diluted	36,203,631	33,222,085
Net loss per share – basic	$ (1.86)	$ (1.47)
Net loss per share – diluted	$ (1.86)	$ (1.47)