Significant accounting policies (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Liability    
Derivative liability $ 241,715  
Level 1
   
Liability    
Derivative liability      
Level 2
   
Liability    
Derivative liability      
Level 3
   
Liability    
Derivative liability $ 4,402,306 $ 121,000