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U.S. Government Securities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |
Gross unrealized gains | $ 5,200,000 |
Gross unrealized losses | 0 |
Carrying Value |  |
Due in 1 year | 5,764,000 |
Due in 1 to 5 years | 129,351,000 |
TOTAL | 135,115,000 | $ 140,749,000
Fair Value |  |
Due in 1 year | 5,871,000 |
Due in 1 to 5 years | 134,399,000 |
TOTAL | $ 140,270,000 |

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