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Stockholders' Deficit - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2021
Jul. 30, 2019
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jul. 01, 2021
Jun. 30, 2021
Class Of Stock [Line Items]                  
Common stock, shares authorized     400,000,000   400,000,000   400,000,000 400,000,000 200,000,000
New Sales Agreement [Member] | Canaccord [Member]                  
Class Of Stock [Line Items]                  
Aggregate gross sales amount of common stock $ 75,000,000.0                
Percentage of agent service fee   3.00%              
Number of shares issued/sold     3,080,451 0 3,668,784 336,188      
Proceeds from issuance of common stock     $ 22,200,000   $ 28,100,000 $ 20,000,000.0      
Original Sales Agreement | Canaccord [Member]                  
Class Of Stock [Line Items]                  
Percentage of agent service fee   3.00%