Nature of Operations and Liquidity - Additional Information (Detail) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) Segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of operating segment | Segment					1
Net loss	$ 19,928	$ 22,438	$ 17,248	$ 4,053	$ 42,366	$ 21,301
Accumulated deficit	357,127				357,127		$ 314,761
Cash, cash equivalents and short-term investments	$ 86,500				$ 86,500