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Fair Value (Details 1) (Fair Value, Measurements, Recurring, Significant Unobservable Inputs (Level 3), Common stock warrants, USD $)
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9 Months Ended |
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Sep. 30, 2012
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Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Common stock warrants
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |
| Beginning of period - January 1, 2012 | $ 5,320,990 |
| Change in fair value of common stock warrants | (3,726,667) |
| Fair value of common stock warrant liability at September 30, 2012 | $ 1,594,323 |