Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net loss	$ (51,609)	$ (103,319)
Induced conversion of preferred stock	(17,284)
Net loss attributable to common stockholders	$ (68,893)	$ (103,319)
Denominator:
Shares used in computing net loss attributable per share to common stockholders, basic and diluted	36,344,234	31,170,351
Net loss attributable per share to common stockholders:
Basic and diluted	$ (1.90)	$ (3.31)