Income Taxes - Components of Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Net deferred income tax assets:
Depreciation and amortization	$ 472	$ 775
Accrued expenses and reserves	921	2,968
Net operating loss carryforwards	22,194	20,652
Capital loss carryforwards	197	290
Research and development credit carryforwards	2,700	2,673
Stock-based compensation	615	487
Gross deferred tax assets	27,099us-gaap_DeferredTaxAssetsGross	27,845us-gaap_DeferredTaxAssetsGross
Less: valuation allowance	(26,842)	(27,673)
Net deferred tax assets	$ 257us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 172us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred tax assets tax depreciation and amortization.

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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 and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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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 research tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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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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