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Post-employment benefits - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
member
Dec. 31, 2022
USD ($)
member
Dec. 31, 2021
Disclosure Of Defined Benefit Plans [Line Items]      
Past service cost gain $ 0.4    
Demographic assumptions increase in weighted turnover 19.50% 15.80%  
Demographic assumption increase in expected employee salaries   3.00% 1.25%
Financial assumptions decrease of discount rate 1.50% 2.25% 0.30%
Average life expectancy in years after retirement for male 22 years 9 months 25 days 24 years 7 months 2 days  
Average life expectancy in years after retirement for female 22 years 8 months 12 days 22 years 5 months 23 days  
United States      
Disclosure Of Defined Benefit Plans [Line Items]      
Post-employment benefit expense, 401(k) defined contribution plan $ 0.4 $ 0.4  
Swiss Pension Plan      
Disclosure Of Defined Benefit Plans [Line Items]      
Number of active members | member 233 248  
Estimating the defined benefit obligation, the discount rates 1.50% 2.25%  
Demographic assumptions increase in expected employee salaries 2.75% 3.00%  
Weighted average modified duration 11 years 8 months 12 days 13 years 2 months 12 days  
LPP interest rate 1.50% 2.25%  
Extra mandatory part equivalent to discount rate 1.50% 2.25%  
Demographic assumptions increase in expected employee turnover rate 1.25% 1.50%  
Expected employer contributions for next annual reporting period $ 1.7    
French Pension Plan      
Disclosure Of Defined Benefit Plans [Line Items]      
Number of active members | member 97 102  
Estimating the defined benefit obligation, the discount rates 3.55% 3.90%  
Demographic assumptions increase in expected employee salaries 3.00%    
Weighted average modified duration 16 years 1 month 6 days 16 years