Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Aug. 14, 2020	Jul. 31, 2021	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Net loss				$ 8,667,000	$ 8,943,000	$ 12,609,000	$ 12,088,000	$ 17,610,000	$ 24,697,000
Accumulated deficit	$ (133,860,000)			(133,860,000)				(133,860,000)		$ (116,250,000)
Cash, cash equivalents and marketable debt securities	54,900,000			$ 54,900,000				$ 54,900,000
ATM Offering [Member] | Common Stock [Member]
Gross sales proceeds under sales agreement remaining amount	$ 29,200,000
Issuance of common stock | shares			2,342,720
Proceeds from issuance of common stock			$ 20,500,000
ATM Offering [Member] | Common Stock [Member] | Maximum [Member]
Aggregate sale of shares of our common stock		$ 50,000,000