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U.S. Government Securities (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |
Gross unrealized gains | $ 1,600,000 |
Gross unrealized losses | 0 |
Carrying Value |  |
Due in 1 year | 129,321,000 |
TOTAL | 129,321,000 | $ 135,115,000
Fair Value |  |
Due in 1 year | 130,910,000 |
TOTAL | $ 130,910,000 |

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