Nature of Operations and Liquidity - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of operating segment | Segment	1
Net loss	$ 22,438	$ 4,053
Accumulated deficit	337,199		$ 314,761
Cash, cash equivalents and short-term investments	$ 107,000