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Investments - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Security	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Security
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	$ 38,117		$ 36,254
Number of securities in unrealized loss position \| Security	15		3
Proceeds from sale of investment in fixed maturity securities	$ 2,900
Proceeds from Sale of Other Investments	4,400
Purchases of investments	5,098	$ 1,513
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	29,072		$ 28,831
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	6,400		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	5,500		7,000
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	$ 9,045		$ 7,423