Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.21.1
Summary of Significant Accounting Policies - Additional Information (Detail)
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
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 $ 900,000 $ 1,500,000  
Government grants receivable 1,400,000   $ 1,100,000
Grant award funding remaining $ 17,500,000