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Additional Paid-In Capital (Summary Of Warrant Activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additional Paid-In Capital [Abstract]
Warrants outstanding (in shares)	15,219,802us-gaap_ClassOfWarrantOrRightOutstanding	19,977,743us-gaap_ClassOfWarrantOrRightOutstanding	19,977,743us-gaap_ClassOfWarrantOrRightOutstanding
Warrants valuation	$ 5.00us-gaap_WarrantsAndRightsOutstanding	$ 4.63us-gaap_WarrantsAndRightsOutstanding	$ 4.25us-gaap_WarrantsAndRightsOutstanding
Weighted average exercise price per share	$ 0.80vgz_ExercisePriceOfWarrantsOrRights	$ 1.60vgz_ExercisePriceOfWarrantsOrRights	$ 2.60vgz_ExercisePriceOfWarrantsOrRights
Weighted average remaining life (yrs.)	2 years 7 months	3 years 8 months	4 years 7 months

X

- Details

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

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

Name:	us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	vgz_EquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms
Namespace Prefix:	vgz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The exercise price of each class of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	vgz_ExercisePriceOfWarrantsOrRights
Namespace Prefix:	vgz_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration