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Summary of Significant Accounting Policies (Details 2)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Outstanding options, warrants and restricted stock units      
Total 11,917,471 18,667,522 3,002,230
Outstanding options [Member]
      
Outstanding options, warrants and restricted stock units      
Total 447,359 875,498 1,098,242
Restricted stock units [Member]
      
Outstanding options, warrants and restricted stock units      
Total 1,534,200 357,541 469,505
Outstanding warrants [Member]
      
Outstanding options, warrants and restricted stock units      
Total 9,935,912 17,434,483 1,434,483