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Additional Paid-In Capital (Summary Of The Status Of Unvested Stock Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additional Paid-In Capital [Abstract]
Unvested, Number of options (in shares)	246,250vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOutstanding	738,750vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOutstanding	300,000vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOutstanding
Granted, Number of options (in shares)	175,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	985,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Vested, Number of options (in shares)	(667,500)vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedDuringPeriod	(546,250)vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedDuringPeriod
Unvested, Weighted average grant-date fair value per option (in dollars per share)	$ 0.22vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	$ 0.22vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	$ 1.47vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Granted, Weighted average grant-date fair value per option (in dollars per share)	$ 0.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 0.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Vested, weighted average grant-date fair value per option (in dollars per share)	$ (0.24)vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedDuringPeriodWeightedAverageGrantDatePrice	$ (0.90)vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedDuringPeriodWeightedAverageGrantDatePrice
Weighted average remaining amortization period	3 years 11 months 27 days

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- Details

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- 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

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- 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

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- 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

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- Definition

Non vested options at the beginning of the period that vest during the period.

+ References

No definition available.

+ Details

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- Definition

Nov vested options at the beginning of the period that vest during the period, price per option.

+ References

No definition available.

+ Details

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