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Right-of-use asset and lease liabilities - Narrative (Details)
€ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2022
ft²
item
Dec. 31, 2021
ft²
item
Nov. 30, 2018
ft²
item
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
May 31, 2021
m²
Dec. 01, 2017
Jun. 30, 2016
Mar. 31, 2016
Nov. 30, 2013
Leases                    
Area of facility (in square feet)     30,655     1,080        
Weighted-average remaining lease term, Operating leases   8 years 3 months 18 days   7 years 2 months 12 days 7 years 2 months 12 days          
Weighted-average discount rate, Operating leases   11.30%   11.20% 11.20%          
Lexington.                    
Leases                    
Lease term (in years) 7 years 4 months 7 years 5 years             10 years
Area of facility (in square feet) | ft² 12,716 13,501                
Number of subsequent renewals | item 1 1 2              
Renewal term (in years) 5 years 5 years 5 years              
Amsterdam                    
Leases                    
Lease term (in years)             10 years   16 years  
Renewal term (in years)               5 years    
Minimum rentals to be received       $ 4.8 € 4.5