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Trade and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]      
Trade receivables $ 12,660 $ 8,827  
Unbilled trade receivables 706 736 $ 372
Tax credits receivable 1,678 397  
Other receivables 646 148  
Trade and other receivables 15,690 10,108  
Cash and cash equivalents      
Disclosure of financial assets [line items]      
Loss allowance $ 1,146 $ 474 $ 447