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Additional Paid-In Capital (Schedule Of Additional Paid-In Capital) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 Warrants [Member] | Dec. 31, 2012 Warrants [Member] | Sep. 30, 2013 Stock Based Compensation [Member] | Sep. 30, 2013 Compensation Options [Member] | Sep. 30, 2013 Other Paid-In Capital [Member] | Sep. 30, 2013 Additional Paid-in Capital [Member]
Balance, beginning of year |  | $ 12,936 | $ 12,936 | $ 7,655 | $ 294 | $ 11,270 | $ 32,155
Stock options expensed |  |  |  | 290 |  |  | 290
Restricted stock units expensed |  |  |  | 922 |  |  | 922
Restricted Stock Units Exercised |  |  |  | (410) |  |  | (410)
Compensation Options Expired | (294) |  |  |  | (294) | 294 |
Balance, end of period |  | $ 12,936 | $ 12,936 | $ 8,457 |  | $ 11,564 | $ 32,957

X
- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AdditionalPaidInCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized. + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). + References No definition available. + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Adjustments to additional paid in capital, compensation options expired. + References No definition available. + Details
Name: | vgz_CompensationOptionsExpired
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The effect on additional paid in capital of restricted stock units exercised. + References No definition available. + Details
Name: | vgz_RestrictedStockUnitsExercised
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration