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 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
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 $ 0 $ 0 $ 0 $ 0  
Number of securities in unrealized loss position for more than 12 months 0   0   0
Grants receivable recognized $ 2,200,000 $ 3,000,000 $ 4,300,000 $ 4,000,000  
Grants receivable 2,100,000   2,100,000   $ 4,100,000
Grants remaining to be awarded 2,700,000   2,700,000    
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