Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Details)

Long-Term Debt - Additional Information (Details) (JP Morgan Chase Debt, USD $)
0 Months Ended
Nov. 30, 2014
Mar. 31, 2015
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Percentage of margin rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1  
Earnings before interest, taxes, depreciation and amortization 10,000,000ingn_EarningsBeforeInterestTaxesDepreciationAndAmortization  
Amount outstanding   0us-gaap_LineOfCredit
Debt Instrument [Line Items]    
Tangible net worth $ 90,000,000us-gaap_TangibleCapital
/ us-gaap_LineOfCreditFacilityAxis
= ingn_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember