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Fair Value Measurements (Schedule of Changes in Level 3 Financial Instruments) (Details) (Contingent Dividend Payment On Convertible Preferred Stock [Member], USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Contingent Dividend Payment On Convertible Preferred Stock [Member]
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||||
| Beginning balance | $ 540,300 | $ 3,656,684 | $ 1,025,000 | $ 4,873,192 |
| Change in fair value | (95,500) | (1,661,584) | (580,200) | (2,878,092) |
| Ending balance | $ 444,800 | $ 1,995,100 | $ 444,800 | $ 1,995,100 |