Income Taxes - Deferred Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss carryforwards	$ 31,252	$ 30,765
Capital loss carryforwards		109
Inventory and other allowances	29us-gaap_DeferredTaxAssetsInventory	31us-gaap_DeferredTaxAssetsInventory
Charitable contribution carryforwards	6	5
Excess (tax) book depreciation	601	492
Excess (tax) book amortization	62	62
Share-based compensation	1,326	1,253
Other accrued costs	279	279
Total deferred tax assets	33,555us-gaap_DeferredTaxAssetsGross	32,996us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance	(33,555)	(32,996)
Deferred income taxes	$ 0us-gaap_DeferredTaxAssetsNet	$ 0us-gaap_DeferredTaxAssetsNet

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill.

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

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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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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