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Summary of Net Deferred Tax Assets and Net Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Capitalized intangible assets for tax purposes $ 202us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets $ 283us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Reserves not currently deductible 1,871us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 1,702us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Deferred revenue 8us-gaap_DeferredTaxAssetsDeferredIncome 8us-gaap_DeferredTaxAssetsDeferredIncome
Stock options 2,911us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,565us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
State taxes 8us-gaap_DeferredTaxAssetsStateTaxes 7us-gaap_DeferredTaxAssetsStateTaxes
Income tax credits 2,200us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 1,583us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Inventory 1,225us-gaap_DeferredTaxAssetsInventory 871us-gaap_DeferredTaxAssetsInventory
Property and equipment 280us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 376us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Other comprehensive income 222us-gaap_DeferredTaxAssetsOtherComprehensiveLoss 109us-gaap_DeferredTaxAssetsOtherComprehensiveLoss
Unrealized gain on foreign currency 136us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 142us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses
Net operating losses 33,140us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 28,058us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Total deferred tax assets 42,203us-gaap_DeferredTaxAssetsGross 35,704us-gaap_DeferredTaxAssetsGross
Valuation allowance (42,069)us-gaap_DeferredTaxAssetsValuationAllowance (35,566)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 134us-gaap_DeferredTaxAssetsNet 138us-gaap_DeferredTaxAssetsNet
Capitalized intangible assets (752)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill (696)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Other (59)us-gaap_DeferredTaxLiabilitiesOther (59)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (811)us-gaap_DeferredIncomeTaxLiabilities (755)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities $ (677)us-gaap_DeferredTaxLiabilities $ (617)us-gaap_DeferredTaxLiabilities