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Subsequent Event (Details) $ in Thousands	Feb. 25, 2016 USD ($)
Subsequent Event [Member] | Great Panther Silver Limited [Member] | Option Agreement [Member] | Guadalupe De Los Reyes Mexico [Member]
Subsequent Event [Line Items]
Amount of payment not made	$ 1,500

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of the payment that will not be made per the terms of the agreement.

+ References

No definition available.

+ Details

Name:	vgz_ContractCancellationAmountOfPaymentNotMade
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=vgz_GreatPantherSilverLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TransactionTypeAxis=vgz_OptionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=vgz_GuadalupeDeLosReyesMexicoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: