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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	$ 380,119us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 24,670us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (263,741)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 175us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning Balance, shares at Dec. 31, 2012	71,503,883us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Shares issued, net of transaction costs	23,464us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Number of shares issued in transaction, (Shares)	10,059,615us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Compensation options exercised, shares					450,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Warrants and Options		7,485vgz_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	403,583us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	32,155us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(334,397)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	2us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	43,013us-gaap_StockholdersEquity
Ending Balance, shares at Dec. 31, 2013	81,563,498us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Shares issued, net of transaction costs	477us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Number of shares issued in transaction, (Shares)	711,719us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Compensation options exercised, shares					125,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Warrants and Options	442vgz_WarrantsAndOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	684vgz_WarrantsAndOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Other comprehensive loss				70us-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	$ 404,912us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 33,171us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ (412,811)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 11us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ 25,283us-gaap_StockholdersEquity
Ending Balance, shares at Dec. 31, 2014	82,390,217us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember

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