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Trade and other receivables, net - Narrative (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
company
Dec. 31, 2019
USD ($)
Disclosure of financial assets that are either past due or impaired [line items]    
Number of well-known multinational companies with good credit quality standing | company 24  
Trade and other receivables | Later than six months    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables past due but not impaired $ 977 $ 318
Trade and other receivables | Past due but not impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables past due but not impaired $ 11,623 $ 5,052
Proportion of outstanding unimpaired trade receivables (as a percent) 50.00% 25.00%