XML 87 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1

Common Shares, ATM Agreement (Details) - At-The-Market Offering Agreement [Member] - H. C. Wainwright And Co., LLC [Member] - USD ($) $ in Thousands	1 Months Ended	2 Months Ended
	Nov. 30, 2017	Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]
Threshold of aggregate sales proceeds	$ 10,000
Offers or sales of common shares under Agreement to be made in Canada	$ 0
Commission rate (as a percent)	2.00%
Reimbursement of certain legal expenses	$ 50
Additional accounting, legal and regulatory costs incurred	$ 156
Offers or sales of common shares		$ 0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of additional accounting, legal and regulatory costs incurred relating to at-the-market agreement by the entity.

+ References

No definition available.

+ Details

Name:	vgz_AdditionalAccountingLegalAndRegulatoryCostsIncurred
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The percentage of commission rate per agreement of the gross sales price per share of common stock sold.

+ References

No definition available.

+ Details

Name:	vgz_CommissionRateGrossSalesPricePerShareOfCommonStockSold
Namespace Prefix:	vgz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount for offers or sales of common shares under the at-the-market agreement.

+ References

No definition available.

+ Details

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

X

- Definition

The amount for offers or sales of common shares under the at-the-market agreement that will be made in Canada.

+ References

No definition available.

+ Details

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

X

- Definition

The cash outflow by the entity for reimbursement of certain legal expenses relating to at-the-market agreement.

+ References

No definition available.

+ Details

Name:	vgz_ReimbursementOfCertainLegalExpenses
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The threshold for aggregate sales proceeds relating to an at-the-market offering agreement of the entity.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=vgz_AtMarketOfferingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=vgz_H.C.WainwrightAndCo.LlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: