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Property and equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property And Equipment Tables Abstract  
Schedule of property and equipment

    Computer equipment     Furniture and fixtures     Leasehold improvements     Total  
Cost                        
Balance at December 31, 2017     2,337       1,500       2,509       6,346  
Additions     3,814       2       -       3,816  
Impairment     (1,105 )     -       -       (1,105 )
Balance at December 31, 2018     5,046       1,502       2,509       9,057  
Additions     186       3       -       189  
Disposals     (719 )     (325 )     -       (1,044 )
Balance at December 31, 2019     4,513       1,180       2,509       8,202  
                                 
Accumulated depreciation                                
Balance at December 31, 2017     1,387       748       1,005       3,140  
Depreciation     2,285       151       465       2,901  
Balance at December 31, 2018     3,672       899       1,470       6,041  
Depreciation     749       116       465       1,330  
Disposals     (660 )     (282 )     -       (942 )
Balance at December 31, 2019     3,761       733       1,935       6,429  
                                 
Net book value                                
At December 31, 2018     1,374       603       1,039       3,016  
At December 31, 2019     752       447       574       1,773