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Nature of Operations and Liquidity - Additional Information (Detail) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) Segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Number of operating segment | Segment							1
Net loss	$ 16,033	$ 17,248	$ 4,053	$ 12,706	$ 13,780	$ 15,082	$ 37,334	$ 41,568
Accumulated deficit	295,854						295,854		$ 258,520
Cash, cash equivalents and short-term investments	$ 104,100						$ 104,100

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