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Long-Term Debt - Additional Information (Details) (USD $)
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0 Months Ended |
12 Months Ended |
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Nov. 30, 2014
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Aug. 22, 2014
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Oct. 12, 2012
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Dec. 31, 2014
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Dec. 31, 2013
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
$ 15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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$ 12,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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| Percentage of margin rate |
1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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| Earnings before interest, taxes, depreciation and amortization |
10,000,000ingn_EarningsBeforeInterestTaxesDepreciationAndAmortization
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| Amount outstanding |
0us-gaap_LineOfCredit
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| Percentage of commitment fee |
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1.00%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
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| Amount of commitment fee |
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120,000us-gaap_LineOfCreditFacilityCommitmentFeeAmount
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| Outstanding term loan and accrued interest paid |
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11,600,000ingn_OutstandingTermLoanAndAccruedInterestPaid
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| Term Loan A |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ingn_TermALoanMember
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| Percentage of margin rate |
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1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ingn_TermALoanMember
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| Amount outstanding |
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0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ingn_TermALoanMember
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417,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ingn_TermALoanMember
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| Term loan interest rate, percentage |
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4.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= ingn_TermALoanMember
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4.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= ingn_TermALoanMember
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| Term Loan B |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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8,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ingn_TermBLoanMember
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| Percentage of margin rate |
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2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ingn_TermBLoanMember
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| Amount outstanding |
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0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ingn_TermBLoanMember
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3,778,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ingn_TermBLoanMember
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| Term loan interest rate, percentage |
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5.75%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= ingn_TermBLoanMember
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5.75%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= ingn_TermBLoanMember
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| Term Loan C |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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12,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ingn_TermCLoanMember
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| Percentage of margin rate |
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2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ingn_TermCLoanMember
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| Amount outstanding |
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0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ingn_TermCLoanMember
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5,666,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ingn_TermCLoanMember
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| Term loan interest rate, percentage |
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5.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= ingn_TermCLoanMember
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5.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_CreditFacilityAxis
= ingn_TermCLoanMember
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| AR Revolver |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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1,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
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| Amount outstanding |
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0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
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| Percentage of line of credit on accounts receivable |
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80.00%ingn_PercentageOfLineOfCreditFacilityLimitedToEligibleAccountsReceivable
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
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| Revolving line of credit expiration date |
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Oct. 13, 2013
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| Term Loan |
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| Debt Instrument [Line Items] |
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| Percentage of margin rate |
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1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ingn_TermLoanMember
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| Term loan Interest rate description |
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Each term loan bore interest at the Base Rate, which is a rate equal to the applicable margin plus the greater of (i) the prime rate, (ii) the federal funds effective rate, as defined in the agreement, plus 1% and (iii) the daily adjusting LIBOR rate, plus 1%.
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| New Term Loan | LIBOR |
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| Debt Instrument [Line Items] |
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| Percentage of margin rate |
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1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ingn_NewTermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
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| Minimum |
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| Debt Instrument [Line Items] |
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| Tangible net worth |
90,000,000us-gaap_TangibleCapital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| JP Morgan Chase Debt |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ingn_JPMorganChaseMember
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| Percentage of margin rate |
1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LineOfCreditFacilityAxis
= ingn_JPMorganChaseMember
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| Earnings before interest, taxes, depreciation and amortization |
10,000,000ingn_EarningsBeforeInterestTaxesDepreciationAndAmortization
/ us-gaap_LineOfCreditFacilityAxis
= ingn_JPMorganChaseMember
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| Amount outstanding |
0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= ingn_JPMorganChaseMember
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| JP Morgan Chase Debt | Minimum |
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| Debt Instrument [Line Items] |
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| Tangible net worth |
$ 90,000,000us-gaap_TangibleCapital
/ us-gaap_LineOfCreditFacilityAxis
= ingn_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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