Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net loss (in thousands)	$ (21,018)	$ (11,317)	$ (68,480)	$ (35,653)
Weighted-average shares outstanding used in computing net loss per share, basic and diluted	50,895,358	3,857,298	22,354,212	3,737,779
Net loss per share, basic and diluted	$ (0.41)	$ (2.93)	$ (3.06)	$ (9.54)