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Revenue - Disaggregation of Accounts Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Allowance for doubtful accounts | $ (8) | $ (39)
Total accounts receivable | 5,491 | 2,629
Commercial and other | Customer Concentration Risk | Accounts Receivable |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable before allowance for credit loss | 150 | 16
International government | Customer Concentration Risk | Accounts Receivable |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable before allowance for credit loss | 3,258 | 76
U.S. federal government and agencies | Customer Concentration Risk | Accounts Receivable |  |
Disaggregation of Revenue [Line Items] |  |
Accounts receivable before allowance for credit loss | $ 2,091 | $ 2,576

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