Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Shareholders' equity and capital stock (Details Textual)

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Shareholders' equity and capital stock (Details Textual)
 1 Months Ended 12 Months Ended 105 Months Ended 12 Months Ended
Feb. 23, 2012
CAD
Dec. 31, 2012
CAD
Dec. 31, 2011
CAD
Dec. 31, 2010
CAD
Dec. 31, 2008
CAD
Dec. 31, 2007
CAD
Dec. 31, 2006
CAD
Dec. 31, 2005
CAD
Dec. 31, 2004
CAD
Dec. 31, 2012
CAD
Feb. 23, 2012
USD ($)
Dec. 31, 2009
Dec. 31, 2012
In Money Stock Option [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2012
Restricted Stock Units (Rsus) [Member]
Dec. 31, 2012
Four and One-Half Months After Grant [Member]
Dec. 31, 2012
Nine Months After Grant [Member]
Dec. 31, 2012
Thirteen and One-Half Months After Grant [Member]
Dec. 31, 2012
Eighteen Months After Date Of Grant [Member]
Dec. 31, 2012
First Anniversary [Member]
Dec. 31, 2012
Second Anniversary [Member]
Common shares and warrants issued for cash, net of issue costs (in shares) 17,250,000                                        
Sale of Stock, Price Per Share                     $ 1.00                    
Common shares and warrants issued for cash, net of issue costs 17,250,000 16,244,543   4,700,151 1,804,686 77,503,307 20,730,039 13,624,935 5,619,647                        
Share issue costs 1,005,457 (1,005,458) 0 (279,849)           (3,854,332)                      
Share-Based Compensation Arrangement By Share-Based Payment Award, Restricted Stock Units, Vested In Period   120,359                                      
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage   10.00%                           22.00% 22.00% 22.00% 24.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   0.43                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   1,900,000 1,800,000 700,000                                  
Share Price   0.83               0.83                      
Outstanding, December 31, 2009   8,511,722 6,413,902 5,665,568           8,511,722   8,361,452 2,609,924                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number   5,994,972               5,994,972     1,153,204                
Share-Based Compensation Arrangement By Share-Based Payment Award, Restricted Share Units Vesting Percentage                                       50.00% 50.00%
Stock based compensation   2,427,031 2,450,734 702,762           21,293,598                      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options   800,000               800,000                      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options   400,000               400,000                      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition                           1 year 1 year 6 months            
Proceeds from Stock Options Exercised   100,000 3,400,000 3,500,000                                  
Allocated Share-based Compensation Expense       100,000                                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price   0.76 0.91 2.87           0.76