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Additional Paid-In Capital (Schedule Of Additional Paid-In Capital) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Apr. 30, 2010	Dec. 31, 2012 Warrants [Member]	Dec. 31, 2011 Warrants [Member]	Dec. 31, 2012 Stock Based Compensation [Member]	Dec. 31, 2011 Stock Based Compensation [Member]	Dec. 31, 2012 Compensation Options [Member]	Dec. 31, 2011 Compensation Options [Member]	Dec. 31, 2012 Other Paid-In Capital [Member]	Dec. 31, 2011 Other Paid-In Capital [Member]	Dec. 31, 2012 Additional Paid-In Capital [Member]	Dec. 31, 2011 Additional Paid-In Capital [Member]
Balance, beginning of year		$ 10,288	$ 10,721	$ 5,065	$ 4,695	$ 588		$ 8,729	$ 7,565	$ 24,670	$ 22,981
Warrant exercised		(601)	(97)					601			(97)
Warrants issued		3,260								3,260
Warrants expired		(11)						11
Convertible notes broker warrants			(336)						336
Compensation Options Issued	588						588				588
Compensation options exercised						(294)		294
Stock options expensed				1,081	1,496					1,081	1,496
Stock options exercised				(50)	(430)			50			(430)
Restricted stock units exercised in the period					(392)						(392)
Stock Options Expired				(1,585)	(828)			1,585	828
Restricted stock units expensed				3,144	524					3,144	524
Balance, end of period		$ 12,936	$ 10,288	$ 7,655	$ 5,065	$ 294	$ 588	$ 11,270	$ 8,729	$ 32,155	$ 24,670

X

- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.30(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Definition

Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized).

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase in additional paid in capital due to warrants issued during the period. Includes also the proceeds of debt securities issued with detachable stock purchase warrants that are allocable to the warrants. These warrants qualify for equity classification and provide the holder with a right to purchase stock from the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Warrant

-URI http://asc.fasb.org/extlink&oid=6528364



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 14

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=7656322&loc=d3e4724-112606

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Value of stock issued during the period as a result of the exercise of stock options, net of any related income tax benefit or expense recognized by the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Change in additional paid in capital due to compensation options exercised during the period.

+ References

No definition available.

+ Details

Name:	vgz_CompensationOptionsExercised
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase in additional paid in capital due to compensation warrants issued during the period.

+ References

No definition available.

+ Details

Name:	vgz_CompensationOptionsIssued
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase in additional paid in capital due to convertible notes broker warrants expiring during the period.

+ References

No definition available.

+ Details

Name:	vgz_ConvertibleNotesBrokerWarrants
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of the change to additional paid in capital due to restricted stock exercised in the period.

+ References

No definition available.

+ Details

Name:	vgz_RestrictedStockUnitsExercisedInPeriod
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Value of stock issued as a result of the exercise of warrants.

+ References

No definition available.

+ Details

Name:	vgz_StockIssuedDuringPeriodValueWarrantsExercised
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Change in additional paid in capital due to stock options expiring during the period.

+ References

No definition available.

+ Details

Name:	vgz_StockOptionsExpired
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Increase in additional paid in capital due to warrants expiring during the period.

+ References

No definition available.

+ Details

Name:	vgz_WarrantsExpired
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration