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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Net Investment Income [Line Items] |  |
Marketable investments | $ 89,873 | $ 112,523
Fair Value, Inputs, Level 1 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 50,015 |
Fair Value, Inputs, Level 2 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 39,858 |
Corporate Bond Securities [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 41,854 | 47,335
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 30,530 |
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 11,324 |
US Treasury Securities [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 19,485 | 24,153
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 19,485 |
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 0 |
Collateralized Mortgage-Backed Securities [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 5,525 | 7,361
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 0 |
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 5,525 |
U S Agency And Government Sponsored Securities [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 11,621 | 14,588
U S Agency And Government Sponsored Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 0 |
U S Agency And Government Sponsored Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 11,621 |
US Treasury Notes Securities [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 10,830 | 11,682
US Treasury Notes Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 0 |
US Treasury Notes Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 10,830 |
Asset-Backed Securities [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 558 | $ 6,406
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | 0 |
Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Net Investment Income [Line Items] |  |
Marketable investments | $ 558 |

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