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Investments - Fair Value, Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Estimated Fair Value | $ 246,685 | $ 137,620
Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 243,638 | 129,371
Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 2,074 | 6,092
Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 973 | 2,157
Quoted Price in Active Markets (Level 1) |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Quoted Price in Active Markets (Level 1) | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Quoted Price in Active Markets (Level 1) | Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Quoted Price in Active Markets (Level 1) | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 246,685 | 137,620
Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 243,638 | 129,371
Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 2,074 | 6,092
Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 973 | 2,157
Significant Unobservable Inputs (Level 3) |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | 0 | 0
Significant Unobservable Inputs (Level 3) | Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Estimated Fair Value | $ 0 | $ 0

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