Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Shareholders' Equity and Capital Stock - addl information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended 15 Months Ended
Mar. 31, 2016
USD ($)
item
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Mar. 31, 2016
CAD / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Feb. 29, 2016
$ / shares
Stockholder's Equity Note [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 16,620          
Share Price | CAD / shares       CAD 0.66    
Payments Of Stock Issuance Costs | $ $ 608          
Stock Issued During Period, Value, New Issues | $ $ 5,694          
Threshold of combined service and age | item 65          
Percent or RSUs that vest 116,804          
Minimum Service For RSU Plan 5 years          
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number     9,974,407   8,736,407  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number         6,702,980  
Stock based compensation | $ $ 209 $ 188 $ 200      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 200          
Proceeds from Stock Options Exercised | $ $ 9 $ 302        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       0    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 1.71   $ 1.06  
Capital Stock            
Stockholder's Equity Note [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 16,620          
Stock Issued During Period, Shares, New Issues 12,921,000          
Share Price | $ / shares           $ 0.50
Stock Issued During Period, Value, New Issues | $ $ 5,694          
In Money Stock Option [Member]            
Stockholder's Equity Note [Line Items]            
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number         0  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $         $ 500  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year          
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 3 months 18 days          
Restricted Stock Units (RSUs) [Member] | Capital Stock            
Stockholder's Equity Note [Line Items]            
Number of securities called by each unit         1  
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%          
First Anniversary [Member] | Restricted Stock Units (RSUs) [Member]            
Stockholder's Equity Note [Line Items]            
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage 50.00%          
Second Anniversary [Member] | Restricted Stock Units (RSUs) [Member]            
Stockholder's Equity Note [Line Items]            
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage 50.00%