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Concentrations of Credit and Other Risks (Details) - Customer Concentration Risk | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Sales Revenue | Raytheon Technologies |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage |  | 16.00% |
Sales Revenue | U.S. Government |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 20.00% | 10.00% |
Accounts Receivable | Two Customers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 40.00% |  | 43.00%

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