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Income Tax - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Loss Carryforwards [Line Items] |  |  |
Current provision for federal income taxes | $ 0 | $ 0 |
Current provision for state income taxes |  | 0 |
Current provision for non-United States income taxes |  | 0 |
Deferred provision for federal income taxes | 0 | 0 |
Deferred provision for state income taxes | 0 | 0 |
Deferred provision for non-United States income taxes | 0 | 0 |
Research and experimental expenditures capitalized | 73,129,000 |  |
Net adjustment for research and experimental expenditures | 65,816,000 |  |
Research and development tax relief | 946,000 | 4,523,000 |
Unrecognized tax benefits | 1,064,000 | 0 | $ 0
Liability for interest and penalties | 0 | 0 |
U.S. Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 48,184,000 | $ 11,620,000 |
Tax credit carryforward | 2,900,000 |  |
U.S. State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 3,705,000 |  |
Tax credit carryforward | 900,000 |  |
U.K. |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | $ 194,454,000 |  |

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