XML 74 R42.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Common Shares (Summary Of The Status Of Unvested Stock Options) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Unvested, Number of options, beginning of period (in shares) | 246,250 | 738,750
Granted, Number of options (in shares) |  | 175,000
Vested, Number of options (in shares) |  | (667,500)
Unvested, Number of options, end of period (in shares) | 246,250 | 246,250
Unvested, Weighted average grant date fair value, beginning of period (in dollars per share) | $ 0.22 | $ 0.22
Unvested, Weighted average grant date fair value per option, end of period (in dollars per share) | $ 0.22 | $ 0.22
Employee, Directors and Consultants Stock Options [Member] |  |
Granted, Number of options (in shares) | 0 |
Weighted average remaining amortization period | 3 years |

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of non-vested options outstanding. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Non vested options at the beginning of the period that vest during the period. + References No definition available. + Details
Name: | vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedDuringPeriod
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=vgz_EmployeeDirectorsAndConsultantsStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |