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Summary of Significant Accounting Policies - Property and Equipment Useful Lives (Details)
12 Months Ended
Dec. 31, 2021
Software, office and computer equipment  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life (in years) 3 years
Leasehold improvements, furniture, fixtures and fittings | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life (in years) 5 years
Leasehold improvements, furniture, fixtures and fittings | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, useful life (in years) 10 years