Net loss per share - Schedule of Earnings Per Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share Basic And Diluted [Abstract]
Net loss	$ (27,674)	$ (20,029)
Weighted average shares of common stock, basic and diluted	37,434,261	2,648,885
Net loss per share, basic and diluted	$ (0.74)	$ (7.56)