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Liquidity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Jan. 31, 2014 | Oct. 18, 2013 | Dec. 31, 2014 Maximum [Member] | Dec. 31, 2014 Minimum [Member]
Cash Burn Rate per Quarter | $ 3,250 |  |  | $ 3,000 | $ 2,500
Approximate Value of Debt Before Paydown |  |  | 9,700 |  |
Approximate Value of Debt After Paydown |  | 3,700 | 6,700 |  |
Expected Debt Paydown |  | 3,000 |  |  |
Final Payment for Sale of Mineral Property |  | $ 6,000 |  |  |

X
- Definition The approximate value of debt the company owes after a paydown of principal. + References No definition available. + Details
Name: | vgz_ApproximateValueOfDebtAfterPaydown
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The approximate value of debt the company owes before a paydown of principal. + References No definition available. + Details
Name: | vgz_ApproximateValueOfDebtBeforePaydown
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The expected amount to be paid down on the company's debt. + References No definition available. + Details
Name: | vgz_ExpectedDebtPaydown
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The final payment amount for the sale of a mineral property held by the company. + References No definition available. + Details
Name: | vgz_FinalPaymentForSaleOfMineralProperty
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant