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Redeemable Series G Preferred Stock (Tables) | 12 Months Ended
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Dec. 31, 2013
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Allocation of Cash from Series G Preferred and Warrants Issued | The following table summarizes the allocation for each of these transactions as of October 11, 2010:
|  | Financing |  |  | Exchange |  |  | Total |
Redeemable preferred stock (1) |  | $ | 2,747,476 |  |  | $ | 888,997 |  |  | $ | 3,636,473 |
Compound embedded derivatives (2) |  |  | 1,389,114 |  |  |  | 261,318 |  |  |  | 1,650,432 |
Warrant derivatives (2) |  |  | 913,410 |  |  |  | 161,190 |  |  |  | 1,074,600 |
Extinguishment loss |  |  | — |  |  |  | (383,023 | ) |  |  | (383,023 | )
|  | $ | 5,050,000 |  |  | $ | 928,482 |  |  | $ | 5,978,482 |
(1) | The fair value of the redeemable preferred stock was estimated based upon its forward cash flow value, at a credit-risk adjusted market interest rate, as enhanced by the fair value of the conversion feature. Credit-risk adjusted rates used to discount the cash flow component ranged from 3.98% to 4.89% over our estimated period to redemption, which was October 2013. The fair value of the conversion feature is reflected in the compound embedded derivative line of the table.
(2) | See NOTE K for information related to the valuation of these financial instruments both on the inception date of the transactions and at December 31, 2013.

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