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Preferred Stock Convertible Redeemable Series E Preferred Stock (Details) (USD $) | 6 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 6 Months Ended |  |  | 0 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Oct. 25, 2012 | Nov. 19, 2010 | Nov. 19, 2010 Series E Seven Percent Senior Convertible Preferred Stock [Member] | Jun. 30, 2013 Series E Seven Percent Senior Convertible Preferred Stock [Member] | Jun. 30, 2013 Warrant to purchase 0.25 of a share of Common Stock [Member] | Nov. 19, 2010 Warrant to purchase 0.25 of a share of Common Stock [Member] | Nov. 19, 2010 Warrant to purchase 0.0155 of a share of Common Stock [Member] | Nov. 19, 2010 Preferred Offering Unit [Member] | Jun. 30, 2013 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of Preferred Shares Required to be Redeemed Monthly |  |  |  |  |  |  | 3.7037% |  |  |  |  |  |
Preferred Offering Units |  |  |  |  | 10,582,011 |  |  |  |  |  |  |  |
Number of Shares of Preferred Stock Included in Preferred Offering Unit |  |  |  |  |  | 1 |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  | 7.00% |  |  |  |  |  |  |
Preferred stock, par value | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  | 0.25 | 0.0155 |  |  |
Stock and Warrants Issued During Period, Shares, Preferred Stock and Warrants |  |  |  |  |  |  |  | 194,405 | 132,249 | 16,442 |  |  |
Sale of Stock, Price Per Share |  |  |  |  | $ 0.945 |  |  |  |  |  |  |  |
Net proceeds from issuance of capital stock | $ 14,248,148 | $ 9,951,227 |  |  |  |  |  |  |  |  | $ 10,000,000 |  |
Net Proceeds from Issuance or Sale of Equity |  |  |  |  |  |  |  |  |  |  | 8,900,000 |  |
Preferred Stock, Shares Outstanding | 10,000 |  | 10,000 | 2,351,558 |  |  |  |  |  |  |  |  |
Common stock issued in payment of dividends for the Convertible Redeemable Series E 7% Preferred Stock |  |  | 3,400,000 |  |  |  |  |  |  |  |  |  |
Proceeds from (Repurchase of) Redeemable Preferred Stock |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |
Payments of Dividends, Preferred Stock and Preference Stock |  |  | 3,100,000 |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Preferred Stock |  |  | 200,000 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Interest Payable, Net |  |  | 36,000 |  |  |  |  |  |  |  |  |  |
Warrant Derivative Liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 32,600 | $ 101,200

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