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Stockholders' Equity (Details Textual) (USD $) | 3 Months Ended |  | 0 Months Ended | 3 Months Ended |  | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended |
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Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | May 14, 2010 Stock and Cash Based Incentive Plan [Member] | Mar. 31, 2013 Stock and Cash Based Incentive Plan [Member] | Mar. 31, 2013 Amended 2000 Stock Option Plan [Member] | Mar. 31, 2013 Common Stock Warrants [Member] | Aug. 31, 2012 Common Stock Warrants [Member] | Jun. 30, 2012 Sales Agreement [Member] | Dec. 31, 2012 Sales Agreement [Member] | Mar. 07, 2013 Underwritten public offering [Member] | Mar. 31, 2013 Underwritten public offering [Member] | Mar. 31, 2013 Underwritten public offering [Member] | Mar. 31, 2013 VGX Equity Compensation Plan [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, capital shares reserved for future issuance |  |  |  |  |  |  |  |  |  |  |  | 27,377,266 | 27,377,266 |
Common stock purchase warrant |  |  |  |  |  |  |  |  |  |  |  | 13,688,633 | 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 | 0.50 |
Class of warrant or right, securities called by warrants or rights, price per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.7936 | $ 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 | 6,000,000 |
Increase in fair value of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 657,000 |
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 | 8,222,966 |  |  |  |  |  |  |  |  | 9,344,611 |  |  |  |
Weighted average price per share on sale of common stock | $ 0.70 |  | $ 0.59 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants | $ 5,600,000 |  |  |  |  |  |  |  |  | $ 5,300,000 |  |  |  |
Warrants expired to purchase number of shares of common stock |  |  |  |  |  |  | 54,948 | 150,000 |  |  |  |  |  |
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 |  |  |  |  | 11,915,993 |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  | 1,353,868 |  |  |  |  |  |  |  |  |
Number of shares of vested restricted stock outstanding under plan |  |  |  |  | 240,000 |  |  |  |  |  |  |  |  |
Common stock, other shares, outstanding |  |  |  |  | 9,998,912 |  |  |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum contractual term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Options, outstanding, number |  |  |  |  |  | 1,276,435 |  |  |  |  |  |  |  | 7,218,176

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- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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