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Summary of Significant Accounting Policies - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
ReportableUnit
Segment
Dec. 31, 2019
USD ($)
Segment
Summary Of Significant Accounting Policies [Line Items]    
Cash equivalents investments with original maturities $ 0 $ 0
Restricted cash 0 40,000
Accounts receivable 0 1,169,000
Impairment loss 0 0
Impairment charges $ 0  
Number of reporting units | ReportableUnit 1  
Qualifying expenditures related to research $ 300,000 1,500,000
Interest or penalties related to income tax matters $ 0 $ 0
Number of operating segment | Segment 1 1
BARDA Contract [Member] | Development [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Revenue recognized $ 300,000 $ 7,000,000
Customer Concentration Risk [Member] | Revenue Recognized [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Concentration risk percentage 100.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Concentration risk percentage 100.00% 100.00%
Minimum [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Useful lives of the assets 3 years  
Maximum [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Useful lives of the assets 5 years  
Letter of Credit [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Letters of credit amount pursuant to lease agreement   $ 40,000