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Warrant Liability (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2012
Summary of changes in fair value of warrant liability  
Number of warrants, ending balance 9,935,912
Series A Warrants [Member]
  
Summary of changes in fair value of warrant liability  
Number of warrants, beginning balance 8,000,000
Fair value of warrant liability, beginning balance $ 3,790,160
Number of warrants issued 2,700,000
Fair value of warrants issued 1,714,436
Number of warrants exercised (2,198,571)
Number of warrants expired   
Fair value of warrants exercised (3,340,155)
Fair value, changes in fair value at period end 6,992,956
Number of warrants, ending balance 8,501,429
Fair value of warrant liability, ending balance 9,157,397
Series B Warrants [Member]
  
Summary of changes in fair value of warrant liability  
Number of warrants, beginning balance 8,000,000
Fair value of warrant liability, beginning balance 2,220,960
Number of warrants issued   
Fair value of warrants issued   
Number of warrants exercised (2,700,000)
Number of warrants expired (5,300,000)
Fair value of warrants exercised (1,095,802)
Fair value, changes in fair value at period end (1,125,158)
Number of warrants, ending balance   
Fair value of warrant liability, ending balance