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Investments- Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized Cost | $ 252,405 | $ 278,131
Accrued Interest | 51 | 135
Gross Unrealized Gains | 1 | 150
Gross Unrealized Losses | (236) | (72)
Estimated Fair Value | $ 252,221 | $ 278,344
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Investments | Investments
Obligations of U.S. Government and its agencies |  |
Marketable Securities [Line Items] |  |
Amortized Cost | $ 251,425 | $ 277,151
Accrued Interest | 45 | 121
Gross Unrealized Gains | 1 | 150
Gross Unrealized Losses | (231) | (64)
Estimated Fair Value | 251,240 | 277,358
Certificates of deposit |  |
Marketable Securities [Line Items] |  |
Amortized Cost | 980 | 980
Accrued Interest | 6 | 14
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (8)
Estimated Fair Value | $ 981 | $ 986

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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