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U.S. Department of Defense ("DoD") Expense Reimburesement Grant (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Unusual or Infrequent Item, or Both [Line Items]      
Prepaid expenses and other current assets $ 739 $ 739 $ 579
Other Transaction Authority for Prototype Agreement      
Unusual or Infrequent Item, or Both [Line Items]      
Grants Receivable 13,300 13,300  
Contra-research and development expense 600 600  
Prepaid expenses and other current assets $ 300 $ 300