Annual report pursuant to Section 13 and 15(d)

Going Concern - Additional Information (Detail)

v3.22.4
Going Concern - Additional Information (Detail) - USD ($)
 12 Months Ended
Oct. 03, 2022
Feb. 28, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Net loss     $ (16,891,000) $ (29,199,000) $ (44,836,000)  
Net cash used by operating activities     (19,364,000) (18,811,000) (43,672,000)  
Cash, cash equivalents, and restricted cash     3,526,000 14,421,000 $ 18,289,000 $ 60,038,000
Current liabilities     1,662,000 $ 4,854,000    
Common stock, issued and sold   3,880,000        
Issuance of common stock   $ 10,000,000        
After deduction of underwriting discounts and estimated other offering expenses   $ 900,000        
ATM Facility [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Common stock, issued and sold 2,000,000          
After deduction of underwriting discounts and estimated other offering expenses $ 100,000          
Common stock shares subscribed but not issued 15,661,000          
Shelf Registration Statement [Member] | ATM Facility [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Minimum public float     75,000,000      
Maximum [Member] | ATM Facility [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Common stock shares subscribed but not issued 15,661,000          
Pre-funded Warrants [Member] | Maximum [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Warrants issued (in shares)   3,880,000        
Common Warrants [Member] | Maximum [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Warrants issued (in shares)   7,760,000        
Equipment [Member]            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Restricted cash     $ 100,000