Significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Schedule of liabilities under the fair value hierarchy
 
       
2013
 
           
Liability
 
Level 1
  
Level 2
  
Level 3
 
           
Derivative liability
  -   -   4,402,306 
 
         
2012
 
           
Liability
 
Level 1
  
Level 2
  
Level 3
 
           
Derivative liability
  -   -   121,000