Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.22.1
Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
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
Number of securities in unrealized loss position for more than 12 months 0 0
Grants receivable recognized $ 2,100,000 $ 900,000
Grants receivable 3,500,000 $ 4,100,000
Grants remaining to be awarded 6,000,000.0  
Level 1 [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Liabilities 0  
Level 2 [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Liabilities $ 0