Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (129,775)	$ (86,527)
Net loss attributable to common stockholders	$ (129,775)	$ (86,527)
Weighted-average common stock outstanding, basic and diluted	35,996,901	12,618,413
Net loss per share attributable to common stockholders, basic and diluted	$ (3.61)	$ (6.86)