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Derivative Instruments - Additional Information (Details)
CAD / shares in Units, shares in Thousands, CAD in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2017
CAD
CAD / shares
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2017
CAD
CAD / shares
shares
Dec. 31, 2011
shares
Dec. 31, 2010
shares
Derivative [Line Items]            
Common shares issuable upon exercise of outstanding warrants   1,362   1,362    
Fair Value Assumptions, Expected Dividend Rate     0.00% 0.00%    
Fair Value Assumptions, Risk Free Interest Rate     0.76% 0.76%    
Stock Options Issuance Exercised 0 0 1 1    
Proceeds from Stock Options Exercised $ 261 CAD 329 $ 326 CAD 416    
Minimum [Member]            
Derivative [Line Items]            
Fair Value Assumptions, Expected Volatility Rate     97.00% 97.00%    
Fair Value Assumptions, Expected Term     6 months 6 months    
Maximum [Member]            
Derivative [Line Items]            
Fair Value Assumptions, Expected Volatility Rate     100.00% 100.00%    
Fair Value Assumptions, Expected Term     7 months 17 days 7 months 17 days    
Invester Option [Member]            
Derivative [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number   39   39    
Canadian Denominated [Member]            
Derivative [Line Items]            
Proceeds from Stock Options Exercised | $     $ 2      
Canadian Dollar [Member]            
Derivative [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number         36 29
Contractor Options Expire On November 19, 2017 [Member]            
Derivative [Line Items]            
Common shares issuable upon exercise of outstanding warrants   20   20    
Class of Warrant or Right, Exercise Price of Warrants or Rights | CAD / shares   CAD 1.89   CAD 1.89    
Contractor Options Expire On April 4, 2018 [Member]            
Derivative [Line Items]            
Common shares issuable upon exercise of outstanding warrants   17   17    
Class of Warrant or Right, Exercise Price of Warrants or Rights | CAD / shares   CAD 1.62   CAD 1.62    
Contractor Options Expire On May 18, 2018 [Member]            
Derivative [Line Items]            
Common shares issuable upon exercise of outstanding warrants   2   2    
Class of Warrant or Right, Exercise Price of Warrants or Rights | CAD / shares   CAD 2.43   CAD 2.43