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Warrant Liability (Details 3) (USD $)
 3 Months Ended
Mar. 31, 2013
Summary of changes in fair value of warrant liability  
Number of warrants, ending balance 9,601,378
Series A Warrants [Member]
  
Summary of changes in fair value of warrant liability  
Number of warrants, beginning balance 8,501,429
Fair value of warrant liability, beginning balance $ 9,157,397
Number of warrants exercised (334,534)
Fair value of warrants exercised (418,841)
Fair value, changes in fair value at period end 213,503
Number of warrants, ending balance 8,166,895
Fair value of warrant liability, ending balance $ 8,952,059