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U.S. Department of Defense (DoD) expense reimbursement contract (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2021 | May 31, 2021 | Dec. 31, 2020 | Jul. 31, 2020
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Prepaid expenses and other current assets | $ 2,986,000 |  | $ 2,986,000 |  |  |  | $ 3,128,000 |
Other Transaction Authority for Prototype Agreement |  |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |  |
Grants Receivable |  |  |  |  |  | $ 17,600,000 |  | $ 13,300,000
Contra-research and development expense | 4,100,000 | $ 0 | 8,100,000 | $ 0 |  |  |  |
Prepaid expenses and other current assets | 1,700,000 |  | 1,700,000 |  |  |  |  |
Deferred research obligation liability | $ 500,000 |  | $ 500,000 |  |  |  |  |
Grant expected to be received |  |  |  |  | $ 17,600,000 |  |  |

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- Details
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