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Investments - Schedule of available for sale investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investments: |  |
Amortized Cost | $ 72,887 | $ 44,655
Gross Unrealized Loss | (14) | 4
Total Fair Value | 72,873 | 44,659
U.S. government securities | Investments |  |
Investments: |  |
Amortized Cost | 38,642 | 4,998
Gross Unrealized Loss | (14) | 1
Total Fair Value | 38,628 | 4,999
U.S. government securities | Cash Equivalents |  |
Investments: |  |
Amortized Cost | 34,245 | 39,657
Gross Unrealized Loss | 0 | 3
Total Fair Value | $ 34,245 | $ 39,660

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