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Subsequent Events (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jul. 31, 2012 | May 02, 2012 | Nov. 30, 2009 | Nov. 30, 2008 | Jun. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 Warrant liabilities [Member] | Jun. 30, 2012 Series A Warrant [Member] | May 02, 2012 Series B Warrant [Member] | Nov. 30, 2009 Series B Warrant [Member] | Nov. 30, 2008 Series B Warrant [Member] | Jun. 30, 2012 Series B Warrant [Member] | Jun. 30, 2012 Series B Warrant [Member] | Dec. 31, 2011 Series B Warrant [Member]
Subsequent events (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised |  |  |  |  |  |  |  |  |  | 615,000 |  |  |  | 1,800,000 | 2,700,000 |
Gross proceeds | $ 861,000 | $ 5,300,000 |  |  | $ 3,375,000 | $ 3,194,202 |  |  |  |  | $ 5,300,000 | $ 12,500,000 | $ 20,000,000 |  | $ 2,250,000 | $ 10,000,000
Number of shares of common stock |  |  |  |  |  |  |  |  |  | 2,700,000 |  | 0.40 | 0.75 |  | 1,800,000 |
Warrants issued |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  | 1,800,000 |
Exercise price of warrant |  |  | 15.00 | 23.00 |  | 1.40 |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding |  |  |  |  | 25,377,631 | 25,377,631 |  | 22,427,955 |  |  |  |  |  |  |  |
Number of shares of common stock |  |  |  |  |  | 4,207,361 |  |  | 615,000 |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  |  |  | $ 2.06 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 8,657,000 | $ 9,524,758 |  |  |  |  |  |  |  |  |
The sales agent is paid compensation equal to 3% of gross proceeds |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |

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