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Property and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning Balance $ 8,549 $ 6,173  
Ending Balance 7,420 8,549 $ 6,173
IT equipment [member]      
Beginning Balance 1,644 695  
Ending Balance 1,300 1,644 695
Furniture and fixtures [member]      
Beginning Balance 2,133 511  
Ending Balance 244 2,133 511
Leasehold improvement [member]      
Beginning Balance 4,597 4,876  
Ending Balance 4,162 4,597 4,876
Other equipment [member]      
Beginning Balance 175 91  
Ending Balance 1,714 175 91
Cost [member]      
Beginning Balance 15,553 13,237 13,201
Additions 2,654 3,973 615
Disposals (2,738) (1,657) (579)
Ending Balance 15,469 15,553 13,237
Cost [member] | IT equipment [member]      
Beginning Balance 4,386 3,366 3,136
Additions 246 1,436 368
Disposals (462) (416) (138)
Ending Balance 4,170 4,386 3,366
Cost [member] | Furniture and fixtures [member]      
Beginning Balance 3,778 2,002 2,147
Additions 461 2,137 30
Disposals (2,255) (361) (175)
Ending Balance 1,984 3,778 2,002
Cost [member] | Leasehold improvement [member]      
Beginning Balance 6,771 7,412 7,458
Additions 39 239 179
Disposals 0 (880) (225)
Ending Balance 6,810 6,771 7,412
Cost [member] | Other equipment [member]      
Beginning Balance 618 457 460
Additions 1,908 161 38
Disposals (21) 0 (41)
Ending Balance 2,505 618 457
Accumulated amortization [member]      
Beginning Balance 7,004 7,064 6,240
Depreciation expense of the year 1,578 1,457 1,371
Disposals (533) (1,517) (547)
Ending Balance 8,049 7,004 7,064
Accumulated amortization [member] | IT equipment [member]      
Beginning Balance 2,742 2,671 2,397
Depreciation expense of the year 587 483 388
Disposals (459) (412) (114)
Ending Balance 2,870 2,742 2,671
Accumulated amortization [member] | Furniture and fixtures [member]      
Beginning Balance 1,645 1,491 1,339
Depreciation expense of the year 149 384 322
Disposals (54) (230) (170)
Ending Balance 1,740 1,645 1,491
Accumulated amortization [member] | Leasehold improvement [member]      
Beginning Balance 2,174 2,536 2,202
Depreciation expense of the year 474 513 556
Disposals 0 (875) (222)
Ending Balance 2,648 2,174 2,536
Accumulated amortization [member] | Other equipment [member]      
Beginning Balance 443 366 302
Depreciation expense of the year 368 77 105
Disposals (20) 0 (41)
Ending Balance $ 791 $ 443 $ 366