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Investments - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Security | Dec. 31, 2019 USD ($) Security | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | $ 36,254 | $ 32,006 |
Number of securities in unrealized loss position | Security | 3 | 10 |
Proceeds from sale of investment in fixed maturity securities | $ 8,600 | $ 5,800 |
Proceeds from Sale of Other Investments | 11,000 | 8,500 |
Payments to Acquire Investments | 14,168 | 17,520 | $ 9,284
Investments on deposit with the state insurance department | 4,200 |  |
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | 28,831 | 26,622 |
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | Short-term Investments |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | 11,300 |  |
U.S. Treasury securities, obligations of U.S. Government agencies and Municipalities | Bank Time Deposits |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | 7,000 |  |
Corporate Debt Securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Debt Securities | $ 7,423 | $ 5,384 |

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