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Intangible assets and goodwill (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Impairments of intangible assets $ (1,053) $ (4,990) $ 1,164
Impairments of goodwill $ 140 $ 3,254 $ 0
Intangible assets and goodwill [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Discount rate applied to cash flow projections 8.48%    
Period Over Which Management Has Projected Cash Flows 5 years