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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current deferred tax assets:    
Inventory reserves $ 537us-gaap_DeferredTaxAssetsInventory $ 71us-gaap_DeferredTaxAssetsInventory
Accrued expenses 373us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 331us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred rent 17us-gaap_DeferredRentAssetNetCurrent 14us-gaap_DeferredRentAssetNetCurrent
Allowance for uncollectible accounts receivable 32us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 12us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Valuation allowance (959)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (428)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Net current deferred tax asset 0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Noncurrent deferred tax assets:    
Stock-based compensation 1,154us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,170us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Contribution carryforward 2us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards 2us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Research credit carryforward 3,200us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 2,307us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Fixed assets 278us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 235us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Capitalized start up costs 4,233us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 4,676us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Net operating loss carryforwards 51,145us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 38,286us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Gross 60,012us-gaap_DeferredTaxAssetsGrossNoncurrent 46,676us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance (60,009)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (46,672)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Net noncurrent deferred tax asset 3us-gaap_DeferredTaxAssetsNetNoncurrent 4us-gaap_DeferredTaxAssetsNetNoncurrent
Noncurrent deferred tax liability    
Purchase accounting intangibles (3)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (4)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Net deferred tax asset (liability) $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet