Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
Shareholders' Equity and Capital Stock - addl information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
item
$ / shares
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
CAD / shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Stockholder's Equity Note [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     604,319          
Proceeds from Stock Options Exercised | $     $ 408 $ 880        
Share Price | CAD / shares         CAD 0.97      
Payments Of Stock Issuance Costs | $       50        
Minimum Service For RSU Plan     5 years          
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number           7,959,124 8,468,614  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number           7,138,883    
Stock based compensation | $ $ 400 $ 200 $ 457 $ 531        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value | $ / shares     $ 0          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $     $ 400          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     274,574          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares           $ 1.19    
Capital Stock                
Stockholder's Equity Note [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     604,319          
Number of securities called by each unit               1
Warrants                
Stockholder's Equity Note [Line Items]                
Number of securities called by each unit               0.5
In Money Stock Option [Member]                
Stockholder's Equity Note [Line Items]                
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number           2,748,315    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number           2,748,315    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $           $ 400    
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]                
Threshold of combined service and age | item     65          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options | $           $ 400    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     1 year 4 months 24 days          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       0        
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%