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Property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period $ 1,477  
Balance at end of period 2,290 $ 1,477
Furniture and office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period 289  
Balance at end of period 552 289
Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period 886  
Balance at end of period 1,424 886
Land and Building    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period 302  
Balance at end of period 314 302
Cost    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period 2,058 1,741
Additions 1,188 366
Dispositions (107) (37)
Effects of foreign exchange 188 (12)
Balance at end of period 3,327 2,058
Cost | Furniture and office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period 580 466
Additions 534 114
Dispositions (107) 0
Effects of foreign exchange 71 0
Balance at end of period 1,078 580
Cost | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period 1,118 908
Additions 654 252
Dispositions 0 (37)
Effects of foreign exchange 84 (5)
Balance at end of period 1,856 1,118
Cost | Land and Building    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period 360 367
Additions 0 0
Dispositions 0 0
Effects of foreign exchange 33 (7)
Balance at end of period 393 360
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period (581) (455)
Additions (405) (123)
Effects of foreign exchange (51) (3)
Balance at end of period (1,037) (581)
Accumulated depreciation | Furniture and office equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period (291) (233)
Additions (207) (55)
Effects of foreign exchange (28) (3)
Balance at end of period (526) (291)
Accumulated depreciation | Leasehold improvements    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period (232) (178)
Additions (183) (54)
Effects of foreign exchange (17) 0
Balance at end of period (432) (232)
Accumulated depreciation | Land and Building    
Reconciliation of changes in property, plant and equipment [abstract]    
Balance at beginning of period (58) (44)
Additions (15) (14)
Effects of foreign exchange (6) 0
Balance at end of period $ (79) $ (58)