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Summary of Significant Accounting Policies (Details) $ in Thousands | Dec. 31, 2021 USD ($)
--- | ---
Net Investment Income [Line Items] |
Marketable investments | $ 112,523
Fair Value, Inputs, Level 1 [Member] |
Net Investment Income [Line Items] |
Marketable investments | 55,252
Fair Value, Inputs, Level 2 [Member] |
Net Investment Income [Line Items] |
Marketable investments | 57,271
Corporate Bond Securities [Member] |
Net Investment Income [Line Items] |
Marketable investments | 47,335
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
Net Investment Income [Line Items] |
Marketable investments | 31,099
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] |
Net Investment Income [Line Items] |
Marketable investments | 16,236
US Treasury Securities [Member] |
Net Investment Income [Line Items] |
Marketable investments | 24,153
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
Net Investment Income [Line Items] |
Marketable investments | 24,153
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 | 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 | 7,361
U S Agency And Government Sponsored Securities [Member] |
Net Investment Income [Line Items] |
Marketable investments | 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 | 14,588
US Treasury Notes Securities [Member] |
Net Investment Income [Line Items] |
Marketable investments | 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 | 11,682
Asset-backed Securities [Member] |
Net Investment Income [Line Items] |
Marketable investments | 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 | 6,406
Commercial Paper [Member] |
Net Investment Income [Line Items] |
Marketable investments | 998
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member] |
Net Investment Income [Line Items] |
Marketable investments | 0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |
Net Investment Income [Line Items] |
Marketable investments | $ 998

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