Common Stock - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 08, 2020	Dec. 02, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Sep. 04, 2020
Class Of Stock [Line Items]
Common stock, shares authorized			100,000,000	100,000,000	100,000,000	100,000,000
Voting power per share					One
Common stock, dividends declared					$ 0
Common stock shares issued			3,633,334
Net proceeds from issuance of common stock			$ 25,100,000		2,266,000	$ 25,127,000
Common stock shares issued, value						25,128,000
Net Issuance costs					$ 94,000	$ 351,000
Common stock, par value			$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Private Placement [Member]
Class Of Stock [Line Items]
Common stock shares issued, value					$ 4,922,000
Net Issuance costs					$ 78,000
Private Placement [Member] | Investment Agreement [Member] | Eshelman Ventures [Member] | Unregistered Common Stock [Member]
Class Of Stock [Line Items]
Common stock shares issued	931,098
Common stock shares issued, value	$ 5,000,000
Net Issuance costs	$ 78,000
At The Market Offering Program [Member] | Piper Sandler & Co and Cantor Fitzgerald & Co [Member] | Equity Distribution Agreement [Member]
Class Of Stock [Line Items]
Common stock, par value							$ 0.0001
Number of shares sold				377,400
Proceeds from shares sold net of discounts and offering costs				$ 2,300,000
At The Market Offering Program [Member] | Piper Sandler & Co and Cantor Fitzgerald & Co [Member] | Equity Distribution Agreement [Member] | Maximum [Member]
Class Of Stock [Line Items]
Aggregate offering price							$ 60,000,000
Board of Director [Member]
Class Of Stock [Line Items]
Common stock shares issued		133,333
Common stock shares issued, value		$ 1,000,000