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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

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