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Subsequent events (Details)
 9 Months Ended
Sep. 30, 2018
USD ($)
shares
Oct. 01, 2018
CAD ($)
Events After Reporting Period [Member] | Lenders [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Interest rate payable   15.00%
Events After Reporting Period [Member] | Lenders [Member] | Canadian Dollar [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Short-term secured convertible loan | $   $ 5,500,000
Pershing [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Number of common shares to be received by holders of acquired company for each outstanding common share held | shares 0.715  
Number of common shares to be received by holders of acquired company for each outstanding preferred share held | shares 461.440  
Interest rate payable 16.00%  
Proceeds from convertible debt | $ $ 4,000,000