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Research and Development Grant (Details) | 12 Months Ended
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Dec. 31, 2016
Research and Development Grant |
Period for review of program | 4 years

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of time that government agency has right to review the qualifying programs and expenditures. + References No definition available. + Details
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Namespace Prefix: | vgz_
Data Type: | xbrli:durationItemType
Balance Type: | na
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