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Fair Value of Measurements - Valuation techniques and inputs (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value of Measurements |  |
Convertible promissory notes, current | $ 27,794 | $ 31,166
Convertible promissory notes, net of current | $ 6,239 |

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- Details
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