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Components of Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components Of Deferred Tax Assets And Liabilities [Line Items]
Operating loss carryforwards	$ 21,753	$ 19,119
Tax credit carryforwards	317	330
Other temporary differences	2,921	2,070
Deferred Tax Assets, Gross, Total	24,991	21,519
Less valuation allowance	(24,991)	(21,519)
Net deferred tax asset

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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- Definition

The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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