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Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforwards $ 61,457us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 67,503us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Transaction related costs   1,494us-gaap_DeferredTaxAssetsTaxDeferredExpense
Stock-based compensation 4,479us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,460us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Tax credit carryforwards 379us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 393us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Reserves and accruals 282us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 896us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Intangible assets and amortization 384us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Other 5us-gaap_DeferredTaxAssetsOther 127us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets 66,986us-gaap_DeferredTaxAssetsGross 72,873us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Depreciation (3,311)aspn_DeferredTaxLiabilitiesDepreciation (2,717)aspn_DeferredTaxLiabilitiesDepreciation
Total deferred tax liabilities (3,311)us-gaap_DeferredTaxLiabilities (2,717)us-gaap_DeferredTaxLiabilities
Total deferred tax assets and liabilities 63,675aspn_DeferredTaxAssetsLiabilitiesGross 70,156aspn_DeferredTaxAssetsLiabilitiesGross
Valuation allowance (63,675)us-gaap_DeferredTaxAssetsValuationAllowance (70,156)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet