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Income Taxes (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes |  |  |  |  |
Income tax expense | $ 59,000 | $ 50,000 | $ 541,000 | $ 121,000 |
Effective tax rate | 7.20% | 3.70% |  |  |
Unrecognized tax benefits | $ 3,100,000 |  | 3,083,000 | $ 3,203,000 | $ 3,106,000
Unrecognized tax benefits effective tax rate | 1,700,000 |  | $ 1,700,000 |  |
Interest expense or penalties related to unrecognized tax benefits | $ 0 |  |  |  |

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