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Income Taxes - Schedule of Tax Effects of Temporary Differences and Carryforwards that Rise to Significant Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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| Deferred tax assets: | ||
| Net operating loss carryforwards | $ 63,116us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 62,863us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
| Tax credit carryforwards | 4,065us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 3,973us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |
| Accruals | 942us-gaap_DeferredTaxAssetsTaxDeferredExpense | 1,097us-gaap_DeferredTaxAssetsTaxDeferredExpense |
| Property and equipment | 0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 147us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |
| Other | 551us-gaap_DeferredTaxAssetsOther | 97us-gaap_DeferredTaxAssetsOther |
| Gross deferred tax assets | 68,674us-gaap_DeferredTaxAssetsGross | 68,177us-gaap_DeferredTaxAssetsGross |
| Deferred tax liabilities: | ||
| Property and equipment | (8)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
| Purchased Intangible | (2,349)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets |
| Total deferred tax liabilities | (2,357)us-gaap_DeferredIncomeTaxLiabilities | 0us-gaap_DeferredIncomeTaxLiabilities |
| Valuation allowance | (66,317)us-gaap_DeferredTaxAssetsValuationAllowance | (68,177)us-gaap_DeferredTaxAssetsValuationAllowance |
| Net deferred tax assets | $ 0us-gaap_DeferredTaxAssetsNet | $ 0us-gaap_DeferredTaxAssetsNet |
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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