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Derivative Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2013
Components of Derivative Liabilities | The following tables summarize the components of our derivative liabilities and linked common shares as of September 30, 2013 and December 31, 2012.
|  | September 30, 2013 |  |  | December 31, 2012 |
Derivative liabilities: |  |  |  |  |  |  |  |
Embedded derivatives derived from: |  |  |  |  |  |  |  |
Senior Convertible Notes |  | $ | 421,629 |  |  | $ | 1,529,583 |
Warrant derivatives |  |  |  |  |  |  |  |
Senior Convertible Notes |  |  | 1,463,281 |  |  |  | 1,921,094 |
Series G Convertible Preferred Stock |  |  | 1,264,651 |  |  |  | 1,905,526 |
|  |  | 2,727,932 |  |  |  | 3,826,620 |
Total derivative liabilities |  | $ | 3,149,561 |  |  | $ | 5,356,203 |
|  | September 30, 2013 |  |  | December 31, 2012 |
Common shares linked to derivative liabilities: |  |  |  |  |  |  |  |
Embedded derivatives: |  |  |  |  |  |  |  |
Senior Convertible Notes |  |  | 1,980,938 |  |  |  | 4,247,343 |
Warrant derivatives |  |  |  |  |  |  |  |
Senior Convertible Notes |  |  | 1,562,500 |  |  |  | 1,562,500 |
Series G Convertible Preferred Stock |  |  | 2,250,000 |  |  |  | 2,250,000 |
|  |  | 3,812,500 |  |  |  | 3,812,500 |
Total common shares linked to derivative liabilities |  |  | 5,793,438 |  |  |  | 8,059,843 |
Changes in Fair Values of Derivative Liabilities | The amounts that were reflected in our income related to our derivatives for the nine-month periods ended September 30, 2013 and 2012:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Derivative income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) from fair value changes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Convertible Notes |  | $ | 202,034 |  |  | $ | 2,274,033 |  |  | $ | 244,303 |  |  | $ | 1,174,205 |
Series G Convertible Preferred Stock |  |  | — |  |  |  | 286,335 |  |  |  | — |  |  |  | 158,711 |
Warrant derivatives |  |  | 438,119 |  |  |  | 2,241,494 |  |  |  | 1,098,688 |  |  |  | 379,114 |
|  |  | 640,153 |  |  |  | 4,801,862 |  |  |  | 1,342,991 |  |  |  | 1,712,030 |
Redemptions of Senior Convertible Notes |  |  | 230,300 |  |  |  | — |  |  |  | 863,651 |  |  |  | — |
Total derivative income (expense) |  | $ | 870,453 |  |  | $ | 4,801,862 |  |  | $ | 2,206,642 |  |  | $ | 1,712,030 |
Senior Convertible Note [Member] |
Significant Assumptions Utilized in Valuation Technique | Significant inputs and results arising from the Monte Carlo Simulations process are as follows for the compound embedded derivative that has been bifurcated from our Senior Convertible Notes and classified in liabilities:
|  | September 30, 2013 |  | December 31, 2012
Quoted market price on valuation date |  | $3.00 |  | $2.97
Contractual conversion rate |  | $3.17 |  | $3.74
Contractual term to maturity |  | 0.58 Years |  | 1.33 Years
Implied expected term to maturity |  | 0.57 Years |  | 1.24 Years
Market volatility: |  |  |  |
Range of volatilities |  | 24.0% - 46.2% |  | 31.3% - 64.03%
Range of equivalent volatilities |  | 32.2% - 37.8% |  | 38.6% - 45.0%
Contractual interest rate |  | 8.0% - 9.0% |  | 8.0% - 9.0%
Range of equivalent market risk adjusted interest rates |  | 8.02% - 9.08% |  | 9.0% - 9.1%
Range of equivalent credit risk adjusted yields |  | 0.58% |  | 0.94% - 1.03%
Risk-free rates |  | 0.03% - 0.04% |  | 0.02% - 0.16%
Compound Embedded Derivative [Member] |
Changes in Fair Value Inputs and Assumptions | The following table reflects the issuances of compound embedded derivatives, redemptions and changes in fair value inputs and assumptions related to the compound embedded derivatives during the periods ended September 30, 2013 and 2012.
|  | Nine Months ended September 30, |
|  | 2013 |  |  | 2012 |
Balances at January 1 |  | $ | 1,529,583 |  |  | $ | 2,680,133 |
Issuances |  |  | — |  |  |  | 1,291,298 |
Expirations from redemptions of host contracts reflected in income |  |  | (863,652 | ) |  |  | (650,627 | )
Changes in fair value inputs and assumptions reflected in income |  |  | (244,302 | ) |  |  | (682,289 | )
Balances at September 30 |  | $ | 421,629 |  |  | $ | 2,638,515 |
Warrant Derivatives [Member] |
Significant Assumptions Utilized in Valuation Technique | Significant assumptions and utilized in the Binomial Lattice process are as follows for both the issuance dates of the warrants and September 30, 2013 and 2012 and December 31, 2012:
|  | September 30, |  | December 31, 2012
|  | 2013 |  | 2012 |
Linked common shares |  | 1,725,000 |  | 1,800,000 |  | 1,725,000
Quoted market price on valuation date |  | $3.00 |  | $3.15 |  | $2.97
Contractual exercise rate |  | $2.4648 |  | $2.50 |  | $2.4648
Term (years) |  | 0.03 |  | 1.03 |  | 0.78
Range of market volatilities |  | 24.0% - 31.5% |  | 38.9% - 68.1% |  | 33.1% - 49.17%
Risk free rates using zero coupon US Treasury Security rates |  | 0.03% |  | 0.06% - 0.17% |  | 0.02% - 0.11%
|  | September 30, |  | December 31, 2012
|  | 2013 |  | 2012 |
Linked common shares |  | 525,000 |  | 525,000 |  | 525,000
Quoted market price on valuation date |  | $3.00 |  | $3.15 |  | $2.97
Contractual exercise rate |  | $2.4648 |  | $2.75 |  | $2.4648
Term (years) |  | 0.54 |  | 1.54 |  | 1.28
Range of market volatilities |  | 26.3% - 46.1% |  | 38.7% - 69.2% |  | 33.8% - 63.6%
Risk free rates using zero coupon US Treasury Security rates |  | 0.02% - 0.04% |  | 0.06% - 0.20% |  | 0.02% - 0.16%
|  | September 30, |  | December 31, 2012
|  | 2013 |  | 2012 |
Linked common shares |  | 1,562,500 |  | 1,562,500 |  | 1,562,500
Quoted market price on valuation date |  | $3.00 |  | $3.15 |  | $2.97
Contractual exercise rate |  | $3.60 |  | $3.60 |  | $3.60
Term (years) |  | 3.61 |  | 4.60 |  | 4.35
Range of market volatilities |  | 38.2% - 60.5% |  | 54.2% - 71.0% |  | 39.2% - 70.2%
Risk free rates using zero coupon US Treasury Security rates |  | 0.02% - 0.63% |  | 0.10% - 0.47% |  | 0.05% - 0.54%
Changes in Fair Value Inputs and Assumptions | The following table reflects the issuances of derivative warrants and changes in fair value inputs and assumptions related to the derivative warrants during the nine months ended September 30, 2013 and 2012.
|  | Nine months ended September 30, |
|  | 2013 |  |  | 2012 |
Balances at January 1 |  | $ | 3,826,619 |  |  | $ | 4,653,160 |
Issuances |  |  | — |  |  |  | 363,542 |
Changes in fair value inputs and assumptions reflected in income |  |  | (1,098,688 | ) |  |  | (379,114 | )
Balances at September 30 |  | $ | 2,727,931 |  |  | $ | 4,637,588 |

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