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Additional Paid-In Capital (Summary Of Warrant Activity) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Additional Paid-In Capital [Abstract] |  |  |
Warrants outstanding (in shares) | 15,219,802 us-gaap_ClassOfWarrantOrRightOutstanding | 19,977,743 us-gaap_ClassOfWarrantOrRightOutstanding | 19,977,743 us-gaap_ClassOfWarrantOrRightOutstanding
Warrants valuation | $ 5.00 us-gaap_WarrantsAndRightsOutstanding | $ 4.63 us-gaap_WarrantsAndRightsOutstanding | $ 4.25 us-gaap_WarrantsAndRightsOutstanding
Weighted average exercise price per share | $ 0.80 vgz_ExercisePriceOfWarrantsOrRights | $ 1.60 vgz_ExercisePriceOfWarrantsOrRights | $ 2.60 vgz_ExercisePriceOfWarrantsOrRights
Weighted average remaining life (yrs.) | 2 years 7 months | 3 years 8 months | 4 years 7 months

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- Details
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- Definition Number of warrants or rights outstanding. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&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 -Article 4 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&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 -Article 4 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The exercise price of each class of warrants or rights outstanding. + References No definition available. + Details
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