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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