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Taxation - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred tax liabilities: |  |
Contingent liability | $ (53,851) | $ (34,565)
Total deferred tax liabilities | (53,851) | (34,565)
Deferred tax assets: |  |
Net operating losses | 54,012 | 38,893
IPR&D asset | 47,793 | 32,700
Future exercisable shares | 7,548 | 11,964
Other | 21 | (516)
Total deferred tax assets | 109,374 | 83,041
Less: valuation allowance | (55,523) | (48,476)
Deferred tax assets, net of valuation allowance | 0 | 0
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset |  |
Valuation Allowance [Roll Forward] |  |
Valuation allowance at January 1 | 48,476 | 30,252
Change in tax rates | (851) | 0
Increase in valuation allowance | 7,898 | 18,224
Valuation allowance at December 31 | $ 55,523 | $ 48,476

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