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Liquidity (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Maximum [Member]
Cash Burn Rate per Quarter	$ 4,500
Minimum [Member]
Cash Burn Rate per Quarter	$ 3,500

X

- Definition

The rate at which cash will be used or spent by the company per quarter.

+ References

No definition available.

+ Details

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