Common Shares - Equity Financings (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common shares			$ 2,212	$ 639
At-The-Market Offering Agreement \| H. C. Wainwright And Co., LLC
Subsidiary, Sale of Stock [Line Items]
Threshold of aggregate sales proceeds			8,000
Proceeds from issuance of common shares	$ 1,391	$ 395	2,212	$ 639
Remaining threshold of aggregate sales proceeds	$ 5,512		$ 5,512

The cash inflow from the additional capital contribution to the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

- Definition

The remaining portion of the threshold for aggregate sales proceeds relating to an equity offering agreement of the entity.

+ References

No definition available.

+ Details

Name:	vgz_RemainingThresholdAggregateSalesProceeds
Namespace Prefix:	vgz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The threshold for aggregate sales proceeds relating to an equity 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

- Details

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

- Details

Name:	srt_CounterpartyNameAxis=vgz_H.C.WainwrightAndCo.LlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: