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Basis of Presentation (Details Textuals) (Common stock warrants)
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1 Months Ended | 6 Months Ended | 12 Months Ended |
|---|---|---|---|
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May 31, 2011
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Jun. 30, 2012
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Dec. 31, 2011
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Common stock warrants
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| Class of Warrant or Right [Line Items] | |||
| Risk-free interest rate | 0.75% | 0.34% | 0.33% |
| Percentage of volatility of the market price of common stock | 94.40% | 77.30% | 78.60% |
| Expected average term of the warrant used | 2 years 6 months | ||
| Method used to calculate fair value of warrants | Black-Scholes pricing model |