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U.S. Government Securities (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |
U.S. Government Securities | $ 142,800,000 | $ 146,900,000
Gross unrealized gain | 3,900,000 |
Gross unrealized losses | 0 |
Carrying Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due in 1 year | 4,842,000 |
Due in 1 year through 5 years | 137,919,000 |
Total | 142,761,000 |
Fair Value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due in 1 year | 4,874,000 |
Due in 1 year through 5 years | 141,790,000 |
Total | $ 146,664,000 |

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