Equity Incentive Plans and Warrants (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Share-based compensation expense outstanding unvested options to be recognized
Fiscal Year 2013	$ 1,013
Fiscal Year 2014	512
Fiscal Year 2015	216
Fiscal Year 2016	61
Thereafter	22
Share based compensation expense expected to be recognized	$ 1,824

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

No definition available.

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Share-based compensation expense expected to be recognized after year four.

No definition available.

Name:	vrnm_ShareBasedCompensationExpenseExpectedToBeRecognizedAfterYearFour
Namespace Prefix:	vrnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Share-based compensation expense expected to be recognized next twelve months.

No definition available.

Name:	vrnm_ShareBasedCompensationExpenseExpectedToBeRecognizedNextTwelveMonths
Namespace Prefix:	vrnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Share-based compensation expense expected to be recognized year four.

No definition available.

Name:	vrnm_ShareBasedCompensationExpenseExpectedToBeRecognizedYearFour
Namespace Prefix:	vrnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Share-based compensation expense expected to be recognized year three.

No definition available.

Name:	vrnm_ShareBasedCompensationExpenseExpectedToBeRecognizedYearThree
Namespace Prefix:	vrnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Share-based compensation expense expected to be recognized year two.

No definition available.

Name:	vrnm_ShareBasedCompensationExpenseExpectedToBeRecognizedYearTwo
Namespace Prefix:	vrnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Namespace Prefix:	vrnm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration