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Financial instruments by category (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]    
Current financial assets available-for-sale $ 3,828,000 $ 2,572,000
Borrowings 479,732,000 595,977,000
Fair value    
Disclosure of fair value measurement of assets [line items]    
Current financial assets available-for-sale 3,828,000 2,572,000
Settlement receivables 34,461,000 5,243,000
Redemption option derivative asset    
Disclosure of fair value measurement of assets [line items]    
Borrowings, net of unamortized discount and transaction costs 5,597,000  
Borrowings (5,597,000) 0
Term loan    
Disclosure of fair value measurement of assets [line items]    
Borrowings 197,761,000 $ 0
Term loan | Fair value    
Disclosure of fair value measurement of assets [line items]    
Borrowings $ 200,000,000