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Research and Development Grant (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($)
Research and Development Grant |
R&D tax incentive refund | $ 10,220

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition A tax incentive credit or grant from a government or taxing authority for research and development activity. + References No definition available. + Details
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Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration