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Intangible assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Amortisation, intangible assets other than goodwill $ (936,000) $ (701,000)  
Intangible assets, net 17,192,000 17,252,000 $ 16,661,000
Exchange differences (1,247,000) 74,000  
Additions 2,123,000 1,218,000  
Impairment charges 0 0 0
Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net 22,358,000 21,482,000 20,190,000
Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net (5,166,000) (4,230,000) (3,529,000)
Goodwill      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net 12,412,000 13,405,000 13,510,000
Exchange differences (993,000) (105,000)  
Additions 0 0  
Goodwill | Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net 12,412,000 13,405,000 13,510,000
Software      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Amortisation, intangible assets other than goodwill (895,000) (661,000)  
Intangible assets, net 3,851,000 2,901,000 2,200,000
Exchange differences (244,000) 186,000  
Additions 2,089,000 1,176,000  
Software | Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net 7,251,000 5,406,000 4,044,000
Software | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net (3,400,000) (2,505,000) (1,844,000)
Others      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Amortisation, intangible assets other than goodwill (41,000) (40,000)  
Intangible assets, net 929,000 946,000 951,000
Exchange differences (10,000) (7,000)  
Additions 34,000 42,000  
Others | Cost      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net 2,695,000 2,671,000 2,636,000
Others | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill [abstract]      
Intangible assets, net $ (1,766,000) $ (1,725,000) $ (1,685,000)