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Additional Paid-In Capital (Summary Of The Status Of Unvested Stock Options) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Additional Paid-In Capital [Abstract]
Unvested, Number of options (in shares)	246,250vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOutstanding	246,250vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumberOutstanding
Unvested, Weighted average grant-date fair value per option (in dollars per share)	$ 0.22vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	$ 0.22vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Weighted average remaining amortization period	3 years 9 months	3 years 11 months 27 days

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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

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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