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Fair Value (Details) (Fair Value, Measurements, Recurring, Common stock warrants, USD $)
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Jun. 30, 2012
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Total
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Common stock warrant liability | $ 3,029,189 |
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Quoted Prices in Active Markets for Identical Items (Level 1)
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Common stock warrant liability | |
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Significant Other Observable Inputs (Level 2)
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Common stock warrant liability | |
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Significant Unobservable Inputs (Level 3)
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Common stock warrant liability | $ 3,029,189 |