Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Additional Information (Details)

v2.4.1.9
Intangible Assets - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2008
Dec. 31, 2011
Dec. 31, 2009
Patents
Finite Lived Intangible Assets [Line Items]            
Estimated useful life of intangible asset 2 years          
Purchased additional patents $ 11us-gaap_PaymentsToAcquireIntangibleAssets $ 169us-gaap_PaymentsToAcquireIntangibleAssets        
Amortization of intangible assets 21us-gaap_AmortizationOfIntangibleAssets 39us-gaap_AmortizationOfIntangibleAssets        
Patient setup video, Website development, redesign and commercials            
Finite Lived Intangible Assets [Line Items]            
Cost incurred for advertising 11us-gaap_AdvertisingRevenueCost
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ingn_PatientSetupVideoWebsiteDevelopmentRedesignAndCommercialsMember
169us-gaap_AdvertisingRevenueCost
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ingn_PatientSetupVideoWebsiteDevelopmentRedesignAndCommercialsMember
       
Comfort Life Medical, LLC            
Finite Lived Intangible Assets [Line Items]            
Acquisition of intangible asset       92us-gaap_FinitelivedIntangibleAssetsAcquired1
/ dei_LegalEntityAxis
= ingn_ComfortLifeMedicalLLCMember
   
Estimated useful life of intangible asset 10 years          
Impairments 0us-gaap_AssetImpairmentCharges
/ dei_LegalEntityAxis
= ingn_ComfortLifeMedicalLLCMember
  0us-gaap_AssetImpairmentCharges
/ dei_LegalEntityAxis
= ingn_ComfortLifeMedicalLLCMember
     
Air Products & Chemicals            
Finite Lived Intangible Assets [Line Items]            
Acquisition of intangible asset           250us-gaap_FinitelivedIntangibleAssetsAcquired1
/ dei_LegalEntityAxis
= ingn_AirProductsChemicalsMember
Estimated useful life of intangible asset 5 years          
Impairments 0us-gaap_AssetImpairmentCharges
/ dei_LegalEntityAxis
= ingn_AirProductsChemicalsMember
0us-gaap_AssetImpairmentCharges
/ dei_LegalEntityAxis
= ingn_AirProductsChemicalsMember
       
Number of patents           4us-gaap_GainContingencyPatentsFoundInfringedUponNumber
/ dei_LegalEntityAxis
= ingn_AirProductsChemicalsMember
Increase in long term liability           250us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ dei_LegalEntityAxis
= ingn_AirProductsChemicalsMember
Purchased additional patents         650us-gaap_PaymentsToAcquireIntangibleAssets
/ dei_LegalEntityAxis
= ingn_AirProductsChemicalsMember
 
Breathe Oxygen Services, LLC            
Finite Lived Intangible Assets [Line Items]            
Acquisition of intangible asset         66us-gaap_FinitelivedIntangibleAssetsAcquired1
/ dei_LegalEntityAxis
= ingn_BreatheOxygenServicesLLCMember
 
Estimated useful life of intangible asset         10 years  
Impairments $ 0us-gaap_AssetImpairmentCharges
/ dei_LegalEntityAxis
= ingn_BreatheOxygenServicesLLCMember
$ 0us-gaap_AssetImpairmentCharges
/ dei_LegalEntityAxis
= ingn_BreatheOxygenServicesLLCMember