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Stockholders' Equity (Details Textual) (USD $) | 9 Months Ended |  |  |  | 0 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 12 Months Ended |  | 3 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | May 31, 2013 | Apr. 30, 2013 | Dec. 31, 2012 | May 14, 2010 Stock and Cash Based Incentive Plan [Member] | Sep. 30, 2013 Stock and Cash Based Incentive Plan [Member] | Sep. 30, 2013 Amended 2000 Stock Option Plan [Member] | Aug. 31, 2012 Common Stock Warrants [Member] | Sep. 30, 2013 Common Stock Warrants [Member] | Mar. 31, 2013 Underwritten public offering [Member] | Sep. 30, 2013 Underwritten public offering [Member] | Sep. 30, 2013 Underwritten public offering [Member] | Jun. 30, 2012 Sales Agreement [Member] | Dec. 31, 2012 Sales Agreement [Member] | Sep. 30, 2013 VGX Equity Compensation Plan [Member] | Sep. 30, 2013 March 2013 Financing [Member] | Sep. 30, 2013 December 2011 financing [Member] | Sep. 30, 2013 January 2011 financing [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 600,000,000 | 300,000,000 | 600,000,000 | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, capital shares reserved for future issuance |  |  |  |  |  |  |  |  |  |  | 27,377,266 |  |  |  |  |  |  |  |
Common stock purchase warrant |  |  |  |  |  |  |  |  |  |  | 13,688,633 |  |  |  |  |  |  |  |
Purchase price per unit of common stock and warrant |  |  |  |  |  |  |  |  |  |  | 0.55 |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by each warrant or right |  |  |  |  |  |  |  |  |  |  | 0.50 |  |  |  |  |  |  |  |
Class of warrant or right, securities called by warrants or rights, price per share |  |  |  |  |  |  |  |  |  |  | $ 0.7936 |  |  |  |  |  |  |  |
Term of the warrants in years |  |  |  |  |  |  |  |  |  |  | 5 years 6 months |  |  |  |  |  |  |  |
Potential proceeds from issue of common stock |  |  |  |  |  |  |  |  |  |  | $ 14,000,000 |  |  |  |  |  |  |  |
Warrants, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |
Increase in fair value of warrants |  |  |  |  |  |  |  |  |  |  |  | 19,600,000.0 | 22,700,000.0 |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised | 20,584,997 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,290,908 | 5,774,784 | 3,665,200
Transaction costs associated with issuance of warrants | 315,970 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential proceeds from sale of common stock through placement agent for resale |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000.0 |  |  |  |  |
Rate of commission or discount to placement agent |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Common stock sold under sales agreement | 14,011,526 |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,344,611 |  |  |  |
Weighted average price per share on sale of common stock | $ 1.11 |  |  |  | $ 0.59 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants | $ 15,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,300,000 |  | $ 8,200,000 | $ 3,800,000 | $ 5,100,000
Warrants expired to purchase number of shares of common stock |  |  |  |  |  |  |  |  | 150,000 | 58,220 |  |  |  |  |  |  |  |  |
Number of additional shares authorized |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of potential shares authorized for issuance under share based compensation plan |  |  |  |  |  | 2,055,331 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 11,915,993 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  | 1,218,868 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of vested restricted stock outstanding under plan |  |  |  |  |  |  | 240,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, other shares, outstanding |  |  |  |  |  |  | 9,259,626 |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum contractual term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options, outstanding, number |  |  |  |  |  |  |  | 1,147,999 |  |  |  |  |  |  |  | 6,574,572 |  |  |

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