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Condensed Consolidated Statements Shareholders' Equity (USD $) In Thousands, except Share data | Common Stock [Member] | Additional Paid-In Capital [Member] | Deficit [Member] | Accumulated Other Comprehensive Income/(Loss) [Member] | Total
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2012 | $ 380,119 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 24,670 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (263,741)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 175 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Beginning Balance, shares at Dec. 31, 2012 | 71,503,883 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Shares issued, net of transaction costs | 23,464 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Number of shares issued in transaction, (Shares) | 10,059,615 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Compensation options exercised, shares |  |  |  |  | 450,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Warrants and Options |  | 7,485 vgz_WarrantsAndOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Other comprehensive loss |  |  |  | (173)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net loss |  |  | (70,656)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (59,488)us-gaap_NetIncomeLoss
Balances at Dec. 31, 2013 | 403,583 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 32,155 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (334,397)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 2 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 43,013 us-gaap_StockholdersEquity
Ending Balance, shares at Dec. 31, 2013 | 81,563,498 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Shares issued, net of transaction costs | 477 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Number of shares issued in transaction, (Shares) | 711,719 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Compensation options exercised, shares |  |  |  |  | 125,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Warrants and Options | 442 vgz_WarrantsAndOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 684 vgz_WarrantsAndOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Other comprehensive loss |  |  |  | 70 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net loss |  |  | (18,926)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (18,926)us-gaap_NetIncomeLoss
Balances at Dec. 31, 2014 | $ 404,912 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 33,171 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (412,811)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 11 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 25,283 us-gaap_StockholdersEquity
Ending Balance, shares at Dec. 31, 2014 | 82,390,217 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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