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Summary of Significant Accounting Policies (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2009 | Nov. 30, 2008 | Mar. 31, 2013 Segment | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Cash equivalents [Member] Maximum [Member] | Dec. 31, 2011 Series A [Member] | Jun. 30, 2012 Series A [Member] | Mar. 31, 2012 Series A [Member] | May 02, 2012 Series B [Member] | Dec. 31, 2011 Series B [Member] | Jun. 30, 2012 Series B [Member] | Mar. 31, 2012 Series B [Member]
Summary of significant accounting policies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments with maturities |  |  |  |  |  | 90 days or less from the date of purchase |  |  |  |  |  |  |
Repurchase of common stock | 400,000 | 1,034,483 |  |  |  |  | 8,000,000 |  |  |  | 8,000,000 |  |
Number of Warrants exercised |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 | 2,700,000
Number of warrants issued on exercise of warrants |  |  |  |  |  |  |  | 2,700,000 | 2,700,000 |  |  |  |
Number of warrants expired by terms |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |
Term of warrant |  | 5 years |  |  |  |  | 5 years |  |  |  | 90 days |  |
Per share of common stock | $ 15.00 | $ 23.00 |  |  |  |  | $ 1.40 |  |  |  | $ 1.25 |  |
Impairment of goodwill |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Value of patent |  |  | 0 |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Segments |  |  | 1 |  |  |  |  |  |  |  |  |  |
impairment in investment |  |  | 0 | 0 |  |  |  |  |  |  |  |  |
Fair value of warrant liability |  |  | 9,035,000 |  |  |  |  |  |  |  |  |  |
Common stock per unit |  |  | $ 1 |  |  |  |  |  |  |  |  |  |
Warrants issued per unit |  |  | $ 1 |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  | (367,507,622) |  | (361,091,175) |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  |  | (39,488) |  | 193,177 |  |  |  |  |  |  |  |
Goodwill |  |  | $ 1,853,042 |  | $ 1,983,426 |  |  |  |  |  |  |  |

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