Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss	$ (90,865)	$ (51,015)	$ (161,354)
Denominator:
Weighted average common shares outstanding, basic	56,730,583	42,539,293	41,323,921
Weighted average common shares outstanding, diluted	56,730,583	42,539,293	41,323,921
Net loss per share, basic	$ (1.60)	$ (1.20)	$ (3.90)
Net loss per share, diluted	$ (1.60)	$ (1.20)	$ (3.90)