Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business - Additional Information (Detail)

v3.22.2.2
Organization and Description of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Aug. 15, 2022
Jul. 29, 2022
Mar. 22, 2021
Mar. 10, 2021
Aug. 14, 2020
May 27, 2020
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Organization And Description Of Business [Line Items]                    
Accumulated deficit             $ (315,865) $ (315,865)   $ (260,552)
Net cash used in operating activities               (36,006) $ (32,557)  
Number of shares issued           11,797,752        
Cash Cash Equivalents And Marketable Securities             17,600 17,600    
Restructuring charge $ 7,700 $ 7,700         7,719 7,719    
Labor and Related Expense 1,600 1,600         1,583 1,583    
write-off of prepaid manufacturing costs $ 6,100 $ 6,100         $ 6,136 6,136    
BARDA Contract [Member] | Base Period BARDA Funding [Member]                    
Organization And Description Of Business [Line Items]                    
Total funding receives in future       $ 9,800            
Barda Extended Contract [Member] | Base Period BARDA Funding [Member]                    
Organization And Description Of Business [Line Items]                    
Total funding receives in future               $ 6,600    
Follow-on Offering [Member]                    
Organization And Description Of Business [Line Items]                    
Public offering price, per unit           $ 4.45        
Stock issued during period, value         $ 150,000          
Over-Allotment Option [Member]                    
Organization And Description Of Business [Line Items]                    
Number of shares issued     11,500,000              
Public offering price, per unit     $ 5              
Proceeds from initial public offer     $ 53,800