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Derivative Financial Instruments (Details 3) (Monte carlo simulations [Member], Series G Convertible Preferred Stock [Member], USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Significant assumptions utilized in valuation technique |  |  |
Quoted market price on valuation date | $ 3.17 | $ 2.46 | $ 2.74
Contractual conversion rate | $ 1.78 | $ 1.78 | $ 1.78
Implied expected term | 3 months 15 days | 8 months 12 days | 5 months 16 days
Market volatility: |  |  |
Equivalent volatility | 47.10% | 104.27% | 74.10%
Market Risk Adjusted Interest Rate: |  |  |
Equivalent market-risk adjusted interest rate | 20.80% | 14.46% | 15.30%
Credit risk adjusted yield rate: |  |  |
Equivalent credit-risk adjusted yield rate | 1.40% | 3.20% | 3.10%
Minimum [Member] |  |  |
Market volatility: |  |  |
Range of volatilities | 34.00% | 69.73% | 49.50%
Market Risk Adjusted Interest Rate: |  |  |
Range of rates (including premiums) | 19.00% | 12.00% | 13.00%
Credit risk adjusted yield rate: |  |  |
Range of rates | 1.30% | 3.21% | 3.10%
Risk free rates using zero coupon US Treasury Security rates: |  |  |
Range of rates | 0.06% | 0.13% | 0.12%
Maximum [Member] |  |  |
Market volatility: |  |  |
Range of volatilities | 72.30% | 125.36% | 101.80%
Market Risk Adjusted Interest Rate: |  |  |
Range of rates (including premiums) | 35.00% | 32.00% | 32.00%
Credit risk adjusted yield rate: |  |  |
Range of rates | 1.80% | 4.85% | 3.70%
Risk free rates using zero coupon US Treasury Security rates: |  |  |
Range of rates | 0.17% | 0.42% | 0.25%

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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