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Segment and related information - Net assets by geographical area (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Segment and related Information [Line Items]    
Total net assets $ 82,724 $ 80,900
Net assets held for sale [Member]    
Segment and related Information [Line Items]    
Total net assets 0 15,196
United States [Member]    
Segment and related Information [Line Items]    
Total net assets 38,921 15,502
Germany [Member]    
Segment and related Information [Line Items]    
Total net assets 17,261 18,354
United Kingdom [Member]    
Segment and related Information [Line Items]    
Total net assets 10,473 14,376
Rest Of The World [Member]    
Segment and related Information [Line Items]    
Total net assets $ 16,069 $ 17,472