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Investments - Schedule of available for sale investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Short-term investments |  |
Amortized Cost | $ 44,655 | $ 114,778
Gross Unrealized Loss | 4 | (877)
Total Fair Value | 44,659 | 113,901
U.S. government securities | Investments: |  |
Short-term investments |  |
Amortized Cost | 4,998 | 114,778
Gross Unrealized Loss | 1 | (877)
Total Fair Value | 4,999 | 113,901
U.S. government securities | Cash Equivalents: |  |
Short-term investments |  |
Amortized Cost | 39,657 | 0
Gross Unrealized Loss | 3 | 0
Total Fair Value | $ 39,660 | $ 0

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