Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details)

v2.4.1.9
Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets (liabilities)    
NOL and credit carryforward $ 22,924us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 25,233us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued expenses 3,575us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 2,686us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Valuation allowance (2,899)us-gaap_DeferredTaxAssetsValuationAllowance (4,122)us-gaap_DeferredTaxAssetsValuationAllowance
Allowance, reserves and other 1,965ingn_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceReservesAndOther  
Net deferred tax assets 25,565us-gaap_DeferredTaxAssetsNet 23,797us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities    
Property, plant, and equipment (3,674)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,643)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other (1,667)us-gaap_DeferredTaxLiabilitiesOther (366)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (5,341)us-gaap_DeferredTaxLiabilities (2,009)us-gaap_DeferredTaxLiabilities
Net deferred tax assets (liabilities) $ 20,224us-gaap_DeferredTaxAssetsLiabilitiesNet $ 21,788us-gaap_DeferredTaxAssetsLiabilitiesNet