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v2.4.1.9

Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
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Deferred tax assets |  |
Net operating loss carryforward | $ 48,749 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 47,516 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock-based compensation | 4,851 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 4,813 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Federal and state R&D tax credit carryforward | 1,249 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 490 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Inventories | 875 us-gaap_DeferredTaxAssetsInventory | 1,713 us-gaap_DeferredTaxAssetsInventory
State tax credits | 0 us-gaap_DeferredTaxAssetsStateTaxes | 1,326 us-gaap_DeferredTaxAssetsStateTaxes
Expenses incurred not currently deductible | 1,379 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther | 880 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Capital loss carryforwards | 0 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards | 95 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Deferred revenue | 154 us-gaap_DeferredTaxAssetsDeferredIncome | 1,147 us-gaap_DeferredTaxAssetsDeferredIncome
Gross deferred tax asset | 57,257 us-gaap_DeferredTaxAssetsGross | 57,980 us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities |  |
Excess tax over book depreciation and amortization | 41,843 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 39,252 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Impairment of long-lived assets | 0 ango_DeferredTaxLiabilitiesImpairmentLosses | 0 ango_DeferredTaxLiabilitiesImpairmentLosses
Gross deferred Liability | 41,843 us-gaap_DeferredIncomeTaxLiabilities | 39,252 us-gaap_DeferredIncomeTaxLiabilities
Valuation Allowance | (1,532)us-gaap_DeferredTaxAssetsValuationAllowance | (712)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset | $ 13,882 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 18,016 us-gaap_DeferredTaxAssetsLiabilitiesNet

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