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Significant Accounting Policies - Concentrations (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Concentration risk |  |  |
Cash and cash equivalents | $ 86,068 | $ 37,747 | $ 70,162
Investments - debt securities |  | 40,576 |
U.S. Treasury Bills |  |  |
Concentration risk |  |  |
Investments - debt securities |  | $ 40,576 |
Credit concentration risk | Assets |  |  |
Concentration risk |  |  |
Cash amount not insured by FDIC | 18,700 |  |
Credit concentration risk | Assets | Money market fund |  |  |
Concentration risk |  |  |
Cash and cash equivalents | 1,400 |  |
Credit concentration risk | Assets | U.S. Treasury Bills |  |  |
Concentration risk |  |  |
Cash and cash equivalents | $ 59,800 |  |

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