Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity and Capital Stock - addl information (Details)

v3.7.0.1
Shareholders' Equity and Capital Stock - addl information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2017
CAD / shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Stockholder's Equity Note [Line Items]          
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $       $ 493  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 549,952        
Stock Issued During Period, Shares, New Issues 1,536,169        
Share Price | (per share)     CAD 0.89 $ 0.76  
Payments Of Stock Issuance Costs | $ $ 43 $ 608      
Stock Issued During Period, Value, New Issues | $ $ 1,126        
Percent or RSUs that vest 175,996        
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number       8,427,740 9,748,934
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number       5,318,333  
Stock based compensation | $ $ 287 209      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 200        
Proceeds from Stock Options Exercised | $ $ 348 $ 9      
Granted, Options 300,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 0.91 $ 0.91
Capital Stock          
Stockholder's Equity Note [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 549,952        
Stock Issued During Period, Shares, New Issues 1,536,169        
Stock Issued During Period, Value, New Issues | $ $ 1,126        
In Money Stock Option [Member]          
Stockholder's Equity Note [Line Items]          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $       $ 800  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 2 months 12 days        
Restricted Stock Units (RSUs) [Member]          
Stockholder's Equity Note [Line Items]          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options | $       $ 500  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 6 months        
Granted, Options 0 0      
Restricted Stock Units (RSUs) [Member] | Capital Stock          
Stockholder's Equity Note [Line Items]          
Number of securities called by each unit       1  
Employee Stock Option [Member]          
Stockholder's Equity Note [Line Items]          
Granted, Options 0 0      
Grant Date [Member] | Employee Stock Option [Member]          
Stockholder's Equity Note [Line Items]          
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage 10.00%        
Four and One Half Months After Grant [Member] | Employee Stock Option [Member]          
Stockholder's Equity Note [Line Items]          
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage 22.00%        
Nine Months After Grant [Member] | Employee Stock Option [Member]          
Stockholder's Equity Note [Line Items]          
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage 22.00%        
Thirteen and One Half Months After Grant [Member] | Employee Stock Option [Member]          
Stockholder's Equity Note [Line Items]          
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage 22.00%        
Eighteen Months After Date Of Grant [Member] | Employee Stock Option [Member]          
Stockholder's Equity Note [Line Items]          
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage 24.00%