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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Derivative [Line Items] |
Components of derivative liabilities |
|  | March 31, 2013 |  |  | December 31, 2012 |
Derivative liabilities: |  |  |  |  |  |  |  |
Embedded derivatives derived from: |  |  |  |  |  |  |  |
Senior Convertible Notes |  | $ | 1,732,257 |  |  | $ | 1,529,583 |
Warrant derivatives |  |  |  |  |  |  |  |
Senior Convertible Notes |  |  | 1,973,281 |  |  |  | 1,921,094 |
Series G Convertible Preferred Stock |  |  | 2,313,075 |  |  |  | 1,905,526 |
|  |  | 4,286,356 |  |  |  | 3,826,620 |
Total derivative liabilities |  | $ | 6,018,613 |  |  | $ | 5,356,203 |
|  | March 31, 2013 |  |  | December 31, 2012 |
Common shares linked to derivative liabilities: |  |  |  |  |  |  |  |
Embedded derivatives: |  |  |  |  |  |  |  |
Senior Convertible Notes |  |  | 3,456,315 |  |  |  | 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 |  |  | 7,268,815 |  |  |  | 8,059,843 |
Changes in fair values of derivative liabilities |
|  | Three months ended March 31, |
|  | 2013 |  |  | 2012 |
Derivative income (expense): |  |  |  |  |  |  |  |
Unrealized gains (losses) from fair value changes: |  |  |  |  |  |  |  |
Senior Convertible Notes |  | $ | (640,562 | ) |  | $ | 511,897 |
Series G Convertible Preferred Stock |  |  | — |  |  |  | (38,927 | )
Warrant derivatives |  |  | (459,737 | ) |  |  | (349,901 | )
|  |  | (1,100,299 | ) |  |  | 123,069 |
Redemptions of Senior Convertible Notes |  |  | 437,889 |  |  |  | — |
Total derivative income (expense) |  | $ | (662,410 | ) |  | $ | 123,069 |
Derivatives Warrant [Member] |
Derivative [Line Items] |
Significant assumptions utilized in valuation technique |
|  | March 31, |  | December 31, 2012
|  | 2013 |  | 2012 |
Linked common shares |  | 1,725,000 |  | 1,800,000 |  | 1,725,000
Quoted market price on valuation date |  | $3.26 |  | $3.11 |  | $2.97
Contractual exercise rate |  | $2.4648 |  | $2.50 |  | $2.4648
Term (years) |  | 0.53 |  | 1.53 |  | 0.78
Range of market volatilities |  | 33.8% - 44.4% |  | 40.8% - 77.7% |  | 33.1% - 49.17%
Risk free rates using zero coupon US Treasury Security rates |  | 0.04% - 0.11% |  | 0.05% - 0.26% |  | 0.02% - 0.11%
|  | March 31, |  | December 31, 2012
|  | 2013 |  | 2012 |
Linked common shares |  | 525,000 |  | 525,000 |  | 525,000
Quoted market price on valuation date |  | $3.26 |  | $3.11 |  | $2.97
Contractual exercise rate |  | $2.4648 |  | $2.75 |  | $2.4648
Term (years) |  | 1.04 |  | 2.04 |  | 1.28
Range of market volatilities |  | 34.1% - 45.3% |  | 42.7% - 78.3% |  | 33.8% - 63.6%
Risk free rates using zero coupon US Treasury Security rates |  | 0.04% - 0.14% |  | 0.09% - 0.33% |  | 0.02% - 0.16%
|  | March 31, |  | December 31, 2012
|  | 2013 |  | 2012 |
Linked common shares |  | 1,562,500 |  | 1,302,083 |  | 1,562,500
Quoted market price on valuation date |  | $3.26 |  | $3.11 |  | $2.97
Contractual exercise rate |  | $3.60 |  | $4.32 |  | $3.60
Term (years) |  | 4.10 |  | 5.11 |  | 4.35
Range of market volatilities |  | 34.1% - 67.7% |  | 49.0% - 77.4% |  | 39.2% - 70.2%
Risk free rates using zero coupon US Treasury Security rates |  | 0.07% - 0.57% |  | 0.07% - 1.04% |  | 0.05% - 0.54%
Custom lattice variable: Probability of exercisability (434,027 linked common shares) |  | — |  | 90% |  | —
Changes in fair value inputs and assumptions |
|  | Three months ended March 31, |
|  | 2013 |  |  | 2012 |
Balances at January 1 |  | $ | 3,826,619 |  |  | $ | 4,653,160 |
Changes in fair value inputs and assumptions reflected in income |  |  | 459,737 |  |  |  | 349,901 |
Balances at March 31 |  | $ | 4,286,356 |  |  | $ | 5,003,061 |
Compound Embedded Derivative [Member] |
Derivative [Line Items] |
Changes in fair value inputs and assumptions |
|  | Three Months ended March 31, |
|  | 2013 |  |  | 2012 |
Balances at January 1 |  | $ | 1,529,583 |  |  | $ | 2,680,133 |
Issuances |  |  | — |  |  |  |  |
Expirations from redemptions of host contracts reflected in income |  |  | (437,889 | ) |  |  | — |
Changes in fair value inputs and assumptions reflected in income |  |  | 640,563 |  |  |  | (472,970 | )
Balances at March 31 |  | $ | 1,732,257 |  |  | $ | 2,207,163 |
Senior Convertible Notes [Member] |
Derivative [Line Items] |
Significant assumptions utilized in valuation technique |
|  | March 31, 2013 |  | December 31, 2012
Quoted market price on valuation date |  | $3.26 |  | $2.97
Contractual conversion rate |  | $3.17 |  | $3.74
Contractual term to maturity |  | 1.08 Years |  | 1.33 Years
Implied expected term to maturity |  | 0.98 - 0.99 Years |  | 1.24 Years
Market volatility: |  |  |  |
Range of volatilities |  | 33.6% - 72.0% |  | 31.3% - 64.03%
Range of equivalent volatilities |  | 37.3% - 47.9% |  | 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 |  | 1.47% - 1.13% |  | 0.94% - 1.03%
Risk-free rates |  | 0.04% - 0.14% |  | 0.02% - 0.16%

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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