XML 33 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Additional Paid-In Capital (Summary Of The Status Of Unvested Stock Options) (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Additional Paid-In Capital [Abstract] |  |
Unvested, Number of options (in shares) | 721,250 | 738,750
Granted, Number of options (in shares) | 175,000 |
Vested, Number of options (in shares) | (192,500) |
Unvested, Weighted average grant-date fair value per option (in dollars per share) | $ 0.24 | $ 0.22
Weighted average remaining amortization period | 2 years 2 months 12 days |

X
- Details
Name: | us-gaap_AdditionalPaidInCapitalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 The number of non-vested stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
Name: | vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOutstanding
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average grant-date fair value of options outstanding as of the balance sheet date as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
Name: | vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | vgz_
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