Equity Rights Offering - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock		1,288,910
Proceeds from issuance of common stock and warrants	$ 19,279	$ 3,308
Stock issuance costs	$ 1,129
Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Common stock issued	5,507,889	575,361
Series A Warrants [Member]
Class Of Warrant Or Right [Line Items]
Warrants to purchase common stock	12,339,256
Exercise price per warrants	$ 2.5668
Series A Warrants [Member] | Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Number of shares can purchase for each warrant	0.4464
Exercise price per share of warrants	$ 5.75
Class of warrant or right, expiration date	Aug. 01, 2025