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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 05, 2023 | Feb. 13, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Earn-out liabilities | $ 14,032 |  | $ 99,700 | $ 0
Simple Agreements for Future Equity ("SAFE Agreements") | 0 |  | $ 20,700 | 18,314
Total liabilities measured at fair value | 25,326 |  |  | 18,314
Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total liabilities measured at fair value | 0 |  |  | 0
Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total liabilities measured at fair value | 0 |  |  | 0
Level 3 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total liabilities measured at fair value | 25,326 |  |  | 18,314
Fair Value, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Earn-out liabilities | 14,032 |  |  |
Warrant liabilities | 11,294 |  |  |
Simple Agreements for Future Equity ("SAFE Agreements") |  |  |  | 18,314
Fair Value, Recurring | Series A Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | 8,612 | $ 17,400 |  |
Fair Value, Recurring | Series B Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | 2,682 | $ 9,300 |  |
Fair Value, Recurring | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Earn-out liabilities | 0 |  |  |
Warrant liabilities | 0 |  |  |
Simple Agreements for Future Equity ("SAFE Agreements") |  |  |  | 0
Fair Value, Recurring | Level 1 | Series A Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | 0 |  |  |
Fair Value, Recurring | Level 1 | Series B Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | 0 |  |  |
Fair Value, Recurring | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Earn-out liabilities | 0 |  |  |
Warrant liabilities | 0 |  |  |
Simple Agreements for Future Equity ("SAFE Agreements") |  |  |  | 0
Fair Value, Recurring | Level 2 | Series A Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | 0 |  |  |
Fair Value, Recurring | Level 2 | Series B Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | 0 |  |  |
Fair Value, Recurring | Level 3 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Earn-out liabilities | 14,032 |  |  |
Warrant liabilities | 11,294 |  |  |
Simple Agreements for Future Equity ("SAFE Agreements") |  |  |  | $ 18,314
Fair Value, Recurring | Level 3 | Series A Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | 8,612 |  |  |
Fair Value, Recurring | Level 3 | Series B Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Warrant liabilities | $ 2,682 |  |  |

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