XML 68 R44.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Capital Stock (Narrative) (Details) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 132 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 USD ($) | Aug. 31, 2012 USD ($) | Jul. 31, 2012 USD ($) item | Apr. 30, 2012 USD ($) | Mar. 31, 2012 USD ($) | Apr. 30, 2011 USD ($) | Apr. 30, 2011 CAD | Dec. 31, 2012 USD ($) | Dec. 31, 2011 | Dec. 31, 2012 USD ($) | Dec. 31, 2012 Warrants [Member] | Jul. 31, 2012 Warrants [Member] USD ($) | Jul. 31, 2012 Compensation Warrants [Member] USD ($)
Proceeds from issuance of common shares | $ 11,500 | $ 265 |  | $ 1,100 | $ 733 | $ 30,870 | 29,700 | $ 733 |  | $ 733 |  |  |
Common shares issued (in shares) |  | 115,217 |  | 478,261 | 225,000 | 9,000,000 | 9,000,000 |  |  |  |  |  |
Warrants issued (in shares) | 4,757,941 |  |  |  |  |  |  | 4,757,941 |  | 4,757,941 |  |  |
Exercises of compensation options (in shares) |  |  |  |  | 225,000 |  |  | 225,000 |  |  |  |  |
Exercises of compensation warrants (in shares) |  | 115,217 |  | 478,261 |  |  |  |  |  |  |  |  |
Private placement number of units sold |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Private placement proceeds from sale of units gross |  |  | 15,000 |  |  |  |  |  |  |  |  |  |
Private placement, number of common share in each unit |  |  | 1 |  |  |  |  |  |  |  |  |  | 1
Private placement, number of common share purchase warrant in each unit |  |  | 0.5 |  |  |  |  |  |  |  |  |  |
Private placement, warrant exercisable period |  |  | 24 months |  |  |  |  |  |  |  |  | 24 months |
Private placement price per common share |  |  |  |  |  |  |  |  |  |  |  | $ 3.60 | $ 3.18
Public Offering, number of units sold | 4,182,550 |  |  |  |  |  |  |  |  |  |  |  |
Over-allotment option units issued | 545,550 |  |  |  |  |  |  |  |  |  |  |  |
Public Offering, price per common share |  |  |  |  |  | 3.30 | 3.30 |  |  |  | 3.30 |  |
Public Offering, number of common shares in each unit | 1 |  |  |  |  |  |  |  |  |  |  |  |
Public Offering, number of common share purchase warrants in each unit | 0.5 |  |  |  |  |  |  |  |  |  |  |  |
Public Offering, warrant exercisable period | 24 months |  |  |  |  | 24 months | 24 months |  |  |  |  |  |
Public Offering, shares per compensation option |  |  |  |  |  | 1 | 1 |  |  |  |  |  |
Compensation Options Issued to Underwriters |  |  | 166,667 |  |  | 450,000 | 450,000 |  | 450,000 |  |  |  |
Fair Value of Options Issued in Equity Placement |  |  |  |  |  | 588 |  |  |  |  |  |  |
Net proceeds from public offering after legal and regulatory costs |  |  |  |  |  | 28,984 |  |  |  |  |  |  |
Number of shares placed by brokers |  |  | 3,333,334 |  |  |  |  |  |  |  |  |  |
Equity issuance commissions and other costs | $ 1,258 |  | $ 770 |  |  |  |  |  |  |  |  |  |
Compensation options exercised, shares |  |  |  |  |  |  |  | 32,500 | 354,984 |  |  |  |

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: 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 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 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of compensation options issued to underwriters as part of an equity placement. + References No definition available. + Details
Name: | vgz_CompensationOptionsIssuedToUnderwriters
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of commissions and other issuance costs related to an equity transaction. + References No definition available. + Details
Name: | vgz_EquityIssuanceCommissionsAndOtherCosts
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of options issued in connection with equity placement. + References No definition available. + Details
Name: | vgz_FairValueOfOptionsIssuedInEquityPlacement
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net proceeds from public offering after legal and regulatory costs. + References No definition available. + Details
Name: | vgz_NetProceedsFromPublicOfferingAfterLegalAndRegulatoryCosts
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of non-option equity instruments issued. + References No definition available. + Details
Name: | vgz_NonOptionEquityInstrumentsIssued
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares placed by brokers in an equity placement. + References No definition available. + Details
Name: | vgz_NumberOfSharesPlacedByBrokers
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of stock units issued in the underwriter's over-allotment option. + References No definition available. + Details
Name: | vgz_OverAllotmentOptionUnitsIssued
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Private placement, number of common share in each unit + References No definition available. + Details
Name: | vgz_PrivatePlacementNumberOfCommonShareInEachUnit
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Private placement, number of common share purchase warrant in each unit. + References No definition available. + Details
Name: | vgz_PrivatePlacementNumberOfCommonSharePurchaseWarrantInEachUnit
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Private placement, number of units sold. + References No definition available. + Details
Name: | vgz_PrivatePlacementNumberOfUnitsSold
Namespace Prefix: | vgz_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Private placement price per common share + References No definition available. + Details
Name: | vgz_PrivatePlacementPricePerCommonShare
Namespace Prefix: | vgz_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Private placement, proceeds from sale of units gross. + References No definition available. + Details
Name: | vgz_PrivatePlacementProceedsFromSaleOfUnitsGross
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Private placement, warrant exercisable period. + References No definition available. + Details
Name: | vgz_PrivatePlacementWarrantExercisablePeriod
Namespace Prefix: | vgz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of common share purchase warrants that are part of each unit in the public offering. + References No definition available. + Details
Name: | vgz_PublicOfferingNumberOfCommonSharePurchaseWarrantsInEachUnit
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of common shares that are part of each unit in the public offering. + References No definition available. + Details
Name: | vgz_PublicOfferingNumberOfCommonSharesInEachUnit
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of equity units sold in a public offering. + References No definition available. + Details
Name: | vgz_PublicOfferingNumberOfUnitsSold
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Price per common share through the public offering. + References No definition available. + Details
Name: | vgz_PublicOfferingPricePerCommonShare
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares per compensation option. + References No definition available. + Details
Name: | vgz_PublicOfferingSharesPerCompensationOption
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Offering, warrant exercisable period. + References No definition available. + Details
Name: | vgz_PublicOfferingWarrantExercisablePeriod
Namespace Prefix: | vgz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based compensation arrangement by share-based payment award options exercised. + References No definition available. + Details
Name: | vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercised
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Shares of common stock issued for warrants exercised during the period. + References No definition available. + Details
Name: | vgz_StockIssuedDuringPeriodSharesExercisesOfWarrants
Namespace Prefix: | vgz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant