Net Loss Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net loss	$ (18,839)	$ (17,624)	$ (10,676)	$ (7,470)	$ (36,463)	$ (18,146)
Denominator:
Weighted average common shares outstanding used to compute net loss per share, basic and diluted	30,551,736		559,671		30,521,600	501,716
Net loss per share attributable to common stockholders	$ (0.62)		$ (19.08)		$ (1.19)	$ (36.17)