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Stockholders' Deficit - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  | 3 Months Ended |  | 3 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Incentive_Plan | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2012 Warrants [Member] Investor | Mar. 31, 2013 Common Stock [Member] | Sep. 30, 2012 Common Stock [Member] | Sep. 30, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Jun. 03, 2010 Common Stock [Member] | Jan. 16, 2008 Common Stock [Member] | Aug. 17, 2007 Common Stock [Member] | Sep. 30, 2012 Common Stock [Member] Warrants [Member] | Sep. 30, 2012 Common Stock [Member] Employee Stock Incentive Plan [Member] | Aug. 17, 2007 Common Stock [Member] Restricted Stock Units (RSUs) [Member] | Sep. 30, 2012 Series G Convertible Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 81,484,779 |  | 81,484,779 |  | 75,416,203 |  |  | 140,000 | 3,174,893 | 1,441,013 |  |  |  |  |  |  |
Common stock, shares value representing payment for principal | $ 8,148 |  | $ 8,148 |  | $ 7,542 |  |  |  | $ 8,316,047 | $ 4,262,527 |  |  |  |  |  |  |
Common shares issued from warrant conversion |  |  |  |  |  |  | 2,010,500 | 287,500 |  |  |  |  |  |  |  |  |
Number of accredited investors to whom common stock stock issued |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
Number of warrants exercised in exchange for common stock shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 287,500 |  |  |
Common stock shares issued employee stock incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,900 |  |
Number of series G preferred stock converted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Number of stock incentive plans |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock incentive plan expiration date |  |  |  |  | Aug. 17, 2007 |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized for stock-based compensation |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 2,500,000 | 2,500,000 |  |  | 500,000 |
Exercise price of incentive option granted |  |  |  |  |  |  |  |  |  | Exercise price of any incentive option granted to an eligible employee owning more than 10% of our outstanding common stock must not be less than 110% of fair market value on the date of the grant. |  |  |  |  |  |  |
Eligible employee threshold percentage |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Purchase price of common stock percentage |  |  |  |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |
Share-based compensation | $ 882,933 | $ 380,143 | $ 2,123,706 | $ 1,298,231 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average estimated fair value of stock options | $ 1.24 | $ 2.09 | $ 1.24 | $ 2.09 |  |  |  |  |  |  |  |  |  |  |  |  |

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