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Going Concern and Management's Plans (Additional Information) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 05, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Apr. 28, 2023
Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Net loss used in the calculation of basic and diluted loss per share   $ (10,349) $ (9,579) $ (10,772) $ (10,471) $ (9,247) $ (9,864) $ (30,700) $ (29,582)    
Accumulated deficit   (233,565)           (233,565)     $ (202,865)
Cash and cash equivalents   3,667           3,667     $ 56,409
Cash and cash equivalents and short-term investments   $ 59,600           $ 59,600      
Common stock, shares issued   23,545,130           23,545,130     13,776,788
Securities Purchase Agreement Initial Closing [Member] | Private Placement [Member]                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Common warrants issued $ 35,000                    
Securities Purchase Agreement Initial Closing [Member] | Private Placement [Member] | Pre-funded Warrants [Member]                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Common stock, shares issued 6,421,350                    
Securities Purchase Agreement Initial Closing [Member] | Accredited Investor [Member] | Private Placement [Member]                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Common warrants issued $ 45,500                    
Common stock, shares issued 8,730,168                 15,151,518  
Common stock warrants to purchase common stock shares 15,151,518                 15,151,518  
Securities Purchase Agreement Second and Third Closing [Member] | Accredited Investor [Member] | Private Placement [Member]                      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                      
Common warrants issued $ 105,000