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Operating segments - Geographical (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Revenue $ 96,586 $ 121,288
Non-current assets 84,507 74,855
China    
Disclosure of geographical areas [line items]    
Revenue 30,791 76,558
Non-current assets 14,012 692
Germany    
Disclosure of geographical areas [line items]    
Revenue 28,685 18,984
U.S.    
Disclosure of geographical areas [line items]    
Revenue 23,505 14,881
Non-current assets 4,880 13,622
Japan    
Disclosure of geographical areas [line items]    
Revenue 3,901 2,579
Belgium    
Disclosure of geographical areas [line items]    
Revenue 3,531 308
Denmark    
Disclosure of geographical areas [line items]    
Revenue 1,889 808
Non-current assets 269 60
UK    
Disclosure of geographical areas [line items]    
Revenue 1,431 943
Netherlands    
Disclosure of geographical areas [line items]    
Revenue 892 374
Canada    
Disclosure of geographical areas [line items]    
Revenue 366 551
Non-current assets 65,346 60,481
Taiwan    
Disclosure of geographical areas [line items]    
Revenue 287 483
France    
Disclosure of geographical areas [line items]    
Revenue 276 1,755
Poland    
Disclosure of geographical areas [line items]    
Revenue 213 2,455
Finland    
Disclosure of geographical areas [line items]    
Revenue 198 379
Norway    
Disclosure of geographical areas [line items]    
Revenue 187 37
Spain    
Disclosure of geographical areas [line items]    
Revenue 168 5
Other countries    
Disclosure of geographical areas [line items]    
Revenue $ 266 $ 188