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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Commitments And Contingencies Tables  
Estimated remaining minimum annual lease commitment
As at December 31, 2012, the estimated remaining minimum annual lease commitment is as follows:

 

  for the     total minimum  
  year ending     lease  
  December 31     payments  
           
  2013     $ 304,382  
  2014       304,382  
  2015       101,461  
          710,225