Net Loss per Share - Summary of Basic and Diluted Net Loss Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (22,924)	$ (11,673)
Denominator:
Weighted-average common shares outstanding, basic and diluted (in shares)	50,127,310	47,827,939
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.46)	$ (0.24)