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Segment and related information - Long-lived assts by geographical area (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment and related Information [Line Items]      
Total long-lived assets $ 50,430 $ 20,100 $ 20,100
Non-current assets held for sale [Member]      
Segment and related Information [Line Items]      
Total long-lived assets 0 6,327  
United States [Member]      
Segment and related Information [Line Items]      
Total long-lived assets 42,222 3,800  
Germany [Member]      
Segment and related Information [Line Items]      
Total long-lived assets 5,022 5,793  
United Kingdom [Member]      
Segment and related Information [Line Items]      
Total long-lived assets 585 966  
Rest Of The World [Member]      
Segment and related Information [Line Items]      
Total long-lived assets $ 2,601 $ 3,214