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Restructuring, impairment, and other related costs - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2025
Dec. 31, 2024
USD ($)
Restructuring Cost and Reserve [Line Items]            
Severance and benefit expense (reversal) $ (450)   $ 6,228      
Accrued expenses and other current liabilities 53,925   53,925     $ 62,440
Impairment of long-lived assets   $ 6,400        
Impairment of long-lived assets and prepaid expenses, and other related costs 827   7,240 $ 0    
United Kingdom            
Restructuring Cost and Reserve [Line Items]            
Impairment of long-lived assets   5,400        
Prepaid expense   1,000        
United Kingdom | Right Of Use Asset            
Restructuring Cost and Reserve [Line Items]            
Impairment of long-lived assets   400        
United Kingdom | Leasehold improvements            
Restructuring Cost and Reserve [Line Items]            
Impairment of long-lived assets   2,700        
Impairment of long-lived assets and prepaid expenses, and other related costs 800   800      
United Kingdom | Equipment            
Restructuring Cost and Reserve [Line Items]            
Impairment of long-lived assets   2,100        
United Kingdom | Furniture and Fixtures            
Restructuring Cost and Reserve [Line Items]            
Impairment of long-lived assets   $ 200        
Employee Severance            
Restructuring Cost and Reserve [Line Items]            
Severance and benefit expense (reversal)     6,200      
Payments for restructuring     3,400      
Accrued expenses and other current liabilities $ 2,800   $ 2,800      
Employee Severance | Forecast | 2025 Restructuring            
Restructuring Cost and Reserve [Line Items]            
Expected number of positions eliminated (as a percent)         0.30