Stockholders' Equity - Common Stock - Additional Information (Detail) - USD ($)	1 Months Ended			3 Months Ended	9 Months Ended		12 Months Ended
	Apr. 30, 2022	Feb. 28, 2022	Jan. 31, 2021	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2021	Nov. 30, 2017
Sale Of Common Stock [Line Items]
Common stock, shares issued					3,343,070			2,721,373
Proceeds from issuance of common stock						$ 14,375,000
Common stock, value of shares issuable									$ 16,000,000.0
Proceeds from issuance of common stock from ATM					$ 7,443,969	$ 319,528
Options Granted [Member]
Sale Of Common Stock [Line Items]
Number of stock options granted					78,247	140,167
Public Offering [Member]
Sale Of Common Stock [Line Items]
Common stock, shares issued			479,166
Shares issued, price per share			$ 30.00
Proceeds from issuance of common stock			$ 14,400,000
Proceeds from issuance of common stock net of underwriting discounts and commissions and offering expenses			$ 13,100,000
FBR Sales Agreement [Member]
Sale Of Common Stock [Line Items]
Common stock, shares issued								0
ATM Sales Agreement [Member]
Sale Of Common Stock [Line Items]
Common stock, shares issued	599,914	21,783		18,091		18,091
Proceeds from issuance of common stock	$ 7,100,000			$ 313,000
Proceeds from issuance of common stock from ATM		$ 172,000
Common stock , weighted average price per share	$ 12.12	$ 8.04		$ 17.64		$ 17.64
ATM Sales Agreement [Member] | Maximum [Member]
Sale Of Common Stock [Line Items]
Potential proceeds from issuance of common stock, net							$ 30,000,000