Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.22.2.2
Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Maturity period of highly liquid investments     three months or less    
Realized gains or losses on marketable securities $ 18 $ 0 $ 18 $ 0  
Number of securities in unrealized loss position for more than 12 months 0 0 0 0  
Grants receivable recognized $ 900,000 $ 3,700,000 $ 5,200,000 $ 7,700,000  
Grants receivable 600,000   600,000   $ 4,100,000
Grants remaining to be awarded 8,500,000   8,500,000    
Level 1 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Liabilities 0   0    
Level 2 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Liabilities $ 0   $ 0