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Stockholders' deficit (Tables)
6 Months Ended
Jun. 30, 2012
Stockholders' deficit [Abstract]  
Schedule of Warrant Activity
Warrants
 
Shares
   
Weighted-
Average
Exercise
Price
   
Weighted-
Average
Remaining
Contractual
Term
   
Aggregate
Intrinsic
Value
 
Outstanding at December 31, 2011
    150,000                    
Exercised, granted, forfeited or expired
    (150,000)     $ 0.05       1.0        
Outstanding at June 30, 2012
    --     $ --       --     $ --  
Exercisable at June 30, 2012
    --     $ --       --     $ --