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Related Party Transactions (Narrative) (Details) (Sierra Partners LLC [Member], USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended
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Aug. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Sierra Partners LLC [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Monthly retainer fee | $ 10 vgz_RelatedPartyTransactionMonthlyRetainerFee / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vgz_SierraPartnersLlcMember |  |
Payments to related party |  | $ 80 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vgz_SierraPartnersLlcMember | $ 120 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vgz_SierraPartnersLlcMember

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of monthly retainer fee expected to be paid to related party pursuant to the agreement. + References No definition available. + Details
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Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration