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Stock-based compensation, Fair Value Assumptions (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 06, 2016
Oct. 31, 2016
Jun. 07, 2016
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Risk-free interest rate - Minimum       1.51% 1.80%
Risk-free interest rate - Maximum       2.18% 1.90%
Volatility       50.00%  
Volatility - Minimum         50.00%
Volatility - Maximum         85.68%
Expected dividend yield       0.00% 0.00%
Expected life       6 years 6 months 6 years 6 months
Estimated forfeiture rate       0.00% 0.00%
Stock-based compensation expense       $ 113 $ 1,753
Unrecognized compensation expense       $ 371  
Weighted average period of recognition       1 year 3 months 18 days  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Share price (in dollars per share)       $ 0.44  
Term of vesting     4 years    
Expiry period of option     10 years    
Shares issued (in shares)     340,000    
Purchase price (in dollars per share)     $ 0.75    
Aggregate fair value of shares issued     $ 128    
Stock Options [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Expiry period of option       10 years  
Stock Options [Member] | Chief Executive Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Term of vesting   3 years      
Shares issued (in shares)   542,500   1,007,500  
Purchase price (in dollars per share)   $ 0.55   $ 0.55  
Aggregate fair value of shares issued   $ 150      
Stock Options [Member] | Non-Employee Board Directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]          
Term of vesting 1 year        
Expiry period of option 10 years 10 years      
Shares issued (in shares) 450,000        
Purchase price (in dollars per share) $ 0.55        
Aggregate fair value of shares issued $ 182