Net Income (Loss) per Share - Computation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net loss - basic and diluted	$ (30,745)	$ (23,301)	$ (25,068)	$ (28,922)	$ (54,046)	$ (53,990)
Weighted-average common shares outstanding:
Weighted average number of shares outstanding basic and diluted	50,059,984		46,799,703		49,989,379	46,762,327
Net loss per share, Basic and Diluted	$ (0.61)		$ (0.54)		$ (1.08)	$ (1.15)