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Stockholders' Equity (Details Textual) (USD $) | 3 Months Ended | 0 Months Ended | 3 Months Ended |  | 0 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | May 14, 2010 Stock and Cash Based Incentive Plan [Member] | Mar. 31, 2014 Stock and Cash Based Incentive Plan [Member] | Mar. 31, 2014 Amended 2000 Stock Option Plan [Member] | Mar. 07, 2013 Underwritten public offering [Member] | Mar. 31, 2013 Underwritten public offering [Member] | Mar. 31, 2014 VGX Equity Compensation Plan [Member] | Mar. 31, 2014 Common Stock [Member] Underwritten public offering [Member] | Mar. 31, 2014 Common Stock [Member] Underwritten public offering overallotment option [Member] | Mar. 31, 2014 March 2013 Financing [Member] | Mar. 31, 2014 March 2013 Financing [Member] | Mar. 31, 2014 January 2011 financing [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period |  |  |  |  |  |  |  |  | 21,810,900 |  |  |  |
Common stock, capital shares reserved for future issuance |  |  |  |  |  |  | 27,377,266 |  |  | 2,844,900 |  |  |
Public offering price, per share |  |  |  |  |  |  |  |  | $ 2.90 |  |  |  |
Proceeds from issuance of common stock | $ 59,209,182 | $ 19,556,383 |  |  |  |  | $ 14,000,000 |  | $ 59,200,000 |  |  |  |
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 |  |  |  |  |  |  |
Transaction costs associated with issuance of warrants | 0 | 315,970 |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued related to warrants exercised |  |  |  |  |  |  |  |  |  |  | 909,091 | 11,574,999 | 6,695,000
Proceeds from issuance of common stock and warrants |  |  |  |  |  |  |  |  |  |  | $ 721,000 |  | $ 9,400,000
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 |  |  |  | 13,971,324 |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  | 210,846 |  |  |  |  |  |  |  |  |
Number of shares of vested restricted stock outstanding under plan |  |  |  | 240,000 |  |  |  |  |  |  |  |  |
Common stock, other shares, outstanding |  |  |  | 11,942,334 |  |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum contractual term | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Options, outstanding, number |  |  |  |  | 809,250 |  |  | 6,196,794 |  |  |  |  |

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