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Income Taxes (Detail) (USD $)	12 Months Ended
Income Taxes (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 10,500,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	10,200,000
Deferred Tax Assets, Net of Valuation Allowance, Current	962,000	519,000
Liability for Uncertain Tax Positions, Current	253,000	361,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 510,000	$ 489,000

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

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

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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