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Stock Incentive Plans - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock-based compensation expense |
$ 518us-gaap_AllocatedShareBasedCompensationExpense
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$ 122us-gaap_AllocatedShareBasedCompensationExpense
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| Rate of reduced stock-based compensation expense for estimated forfeiture |
7.60%ingn_ShareBasedCompensationExpenseReducedRateForEstimatedForfeiture
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6.90%ingn_ShareBasedCompensationExpenseReducedRateForEstimatedForfeiture
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| Share-based Compensation, Unrecognized expense, Nonvested Granted Awards |
4,528us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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1,254us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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| Maximum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option period, expiration |
10 years
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| Stock option period, vested |
4 years
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| Minimum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option period, expiration |
7 years
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| Stock option period, vested |
1 year
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| 2012 Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option shares outstanding |
771,499us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwelveStockIncentivePlanMember
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| Number of equity awards available for grant |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwelveStockIncentivePlanMember
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| 2002 Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option shares outstanding |
555,527us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwoStockIncentivePlanMember
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| Number of equity awards available for grant |
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwoStockIncentivePlanMember
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| 2014 Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option shares outstanding |
728,250us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| Number of equity awards available for grant |
989,577us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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221,178us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| Common stock reserved for future issuance |
1,654,819us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| Terms of shares available for issuance |
The number of shares available for issuance under the 2014 Plan also includes an annual increase on the first day of each fiscal year beginning in 2015, equal to the least of: • 895,346 shares; • 4% of the outstanding shares of common stock as of the last day of our immediately preceding fiscal year; or • such other amount as our board of directors may determine.
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| Common stock capital shares reserved for future issuance maximum annual increase |
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895,346ingn_CommonStockCapitalSharesReservedForFutureIssuanceMaximumAnnualIncrease
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| Percentage on outstanding shares of common stock |
4.00%ingn_PercentageOnOutstandingCommonStock
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| Number of additional number of shares reserve to provision |
762,373us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| 2012 Plan and 2002 Plan | Maximum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option shares outstanding |
2,328,569us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_PlanNameAxis
= ingn_TwentyTwelveAndTwoThousandAndTwoStockIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| 2014 ESPP Plan |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Common stock reserved for future issuance |
309,299us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Terms of shares available for issuance |
The number of shares available for issuance under the 2014 ESPP Plan also includes an annual increase on the first day of each fiscal year beginning in 2015, equal to least of: • 179,069 shares • 1.5% of the outstanding shares of our common stock on the last day of our immediately preceding fiscal year; or • Such other amount as may be determined by the administrator
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| Percentage on outstanding shares of common stock |
1.50%ingn_PercentageOnOutstandingCommonStock
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Number of additional number of shares reserve to provision |
179,069us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Maximum percentage of common stock eligible to purchase through payroll deductions for participants |
15.00%ingn_MaximumPercentageOfCommonStockEligibleToPurchaseUnderEmployeeStockPurchasePlanThroughPayrollDeductions
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Maximum number of shares available for participant to purchase during period |
1,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Potential increase of shares available for issuance |
179,069ingn_PotentialIncreaseInNumberOfSharesAvailableForIssuanceDuringNextPhysicalYear
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Purchase price as percentage of stock price on offering period |
85.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Purchase price as percentage of stock price on exercise date |
85.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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| Stock-based compensation expense |
$ 85us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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