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Warrant Liability (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Nov. 30, 2009 | Nov. 30, 2008 | Mar. 31, 2013 | Mar. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 Series A Warrants [Member] | Dec. 31, 2011 Series A Warrants [Member] | Nov. 30, 2009 Series B Warrant [Member] | Nov. 30, 2008 Series B Warrant [Member] | Mar. 31, 2013 Series B Warrant [Member] | Dec. 31, 2011 Series B Warrant [Member] | May 02, 2012 Series B Warrant [Member]
Warrant Liability (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds |  |  | $ 447,715 | $ 728,623 | $ 3,375,000 |  |  | $ 468,000 |  | $ 12,500,000 | $ 20,000,000 |  | $ 10,000,000 |
Number of shares of common stock |  |  |  |  |  |  |  | 2,198,571 |  | 0.40 | 0.75 | 334,534 |  |
Exercise price | 15.00 | 23.00 |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued |  |  |  |  |  |  |  |  |  | 400,000 | 1,034,483 |  |  |
Series A Warrants expiration |  |  |  |  |  |  |  | December 2016 |  |  |  |  |  |
Warrants sold at public offering price |  |  |  |  |  |  |  |  |  |  |  |  | 1.25 |
Exercise price of warrant |  |  |  |  |  |  |  |  |  |  |  |  | 1.25 |
Exercise price of common stock |  |  |  |  |  |  |  |  | $ 1.40 |  |  |  |  |
Number of warrants issued |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  |
Number of units raised through public offering |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |
Warrants issued |  |  | 2,700,000 |  |  |  |  | 334,534 |  |  |  |  |  |
Unissued warrant at the period end |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000
Warrant Liability (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock in each unit sold to institutional investors |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants in each unit sold to institutional investors | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock in each unit issued in public offering |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Number of series A warrants in each unit issued in public offering |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Number of common stock shares under one series A warrant issued in public offering |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Units sold to institutional investors | 1,000,000 | 1,379,310 |  |  |  |  |  |  |  |  |  |  |  |
Price per unit sold to institutional investors | $ 12.50 | $ 14.50 |  |  |  |  |  |  |  |  |  |  |  |
Total proceeds, net of offering expenses and placement agency fees | $ 11,985,000 | $ 18,637,000 |  |  |  |  |  |  |  |  |  |  |  |
Date of issuance warrant |  |  |  |  |  |  | 90th trading day |  |  |  |  |  |  |
Number of units sold through public offering |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |
Number of Series A Warrants Issued |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |
Number of Series A Warrants Exercised |  |  |  |  |  | 2,198,571 |  |  |  |  |  |  |  |

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