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Equity-settled share-based payments - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2014
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2004
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Term of options granted   10 years      
Share-based compensation expense   $ 10,227 $ 6,406 $ 4,316  
Stock Options, 2004 Stock Incentive Option Plan          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Maximum term of options         10 years
Extended term on options 10 years        
Restricted Stock and Restricted Stock Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Vesting period   3 years      
Vesting rate (as a percent)   33.00%      
Maximum stock authorized (shares)   8,115,495      
Stock already granted (shares)   7,889,063      
Restricted Stock Units          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share-based compensation expense   $ 10,900 $ 6,600 $ 4,400