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v3.3.1.900

Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) [Abstract] |  |
Revenues | $ 0 | $ 0
Operating expense: |  |
Exploration, property evaluation and holding costs | (4,265) | (3,991)
Corporate administration | (3,888) | (3,798)
Depreciation and amortization | (694) | (863)
Gain on disposal of mineral property, net (Note 4) | 1,958 |
Write-down of mineral property (Note 4) |  | (750)
Write-down of Amayapampa interest (Note 9) |  | (4,813)
Write-down of value-added tax receivable | (572) |
Total operating expense | (7,461) | (14,215)
Non-operating income/(expenses): |  |
Gain/(loss) on sale of marketable securities | 12 | 24
Loss on other investments (Note 3) | (1,593) | (4,112)
Write-down of marketable securities and long-term investments |  | (138)
Research and development grant, net (Note 10) | 10,220 |
Interest income | 31 | 10
Interest expense |  | (78)
Other income/(expense) | (198) | (417)
Total non-operating income/(expense) | 8,472 | (4,711)
Income/(loss) before income taxes | 1,011 | (18,926)
Net income/(loss) | 1,011 | (18,926)
Other comprehensive income/(loss): |  |
Unrealized fair value increase/(decrease) on available-for-sale securities (Note 7) | (46) | 70
Comprehensive income/(loss) | $ 965 | $ (18,856)
Basic: |  |
Weighted average number of basic shares outstanding (in shares) | 82,571,182 | 82,294,331
Net income/(loss) per share, Basic | $ 0.01 | $ (0.23)
Diluted: |  |
Weighted average number of diluted shares outstanding (in shares) | 83,755,080 | 82,294,331
Net income/(loss) per share, Diluted | $ 0.01 | $ (0.23)

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X
- Definition The gains (losses) included in results of operations resulting from the sale or disposal of mineral property, net of transaction costs, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property. + References No definition available. + Details
Name: | vgz_GainLossOnDispositionOfMineralPropertyNetOfCosts
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of write-down of value-added tax receivable recognized in the income statement. + References No definition available. + Details
Name: | vgz_ImpairmentValueAddedTaxReceivable
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A tax incentive credit or grant from a government or taxing authority for research and development activity. + References No definition available. + Details
Name: | vgz_TaxIncentiveCreditsResearchAndDevelopment
Namespace Prefix: | vgz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration