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Nature of Operations and Liquidity - Additional Information (Detail) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) Segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of operating segment | Segment							1
Net loss	$ 25,238	$ 19,928	$ 22,438	$ 16,033	$ 17,248	$ 4,053	$ 67,604	$ 37,334
Accumulated deficit	382,365						382,365		$ 314,761
Cash, cash equivalents and short-term investments	$ 64,500						$ 64,500

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