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Liquidity (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013
Maximum [Member] |
Cash Burn Rate per Quarter | $ 4,500
Minimum [Member] |
Cash Burn Rate per Quarter | $ 3,500

X
- Definition The rate at which cash will be used or spent by the company per quarter. + References No definition available. + Details
Name: | vgz_CashBurnRatePerQuarter
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration