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Stock Incentive Plan - Additional Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Mar. 12, 2012
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option shares outstanding |
2,261,633us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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2,328,675us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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| Stock-based compensation expense |
$ 1,451us-gaap_ShareBasedCompensation
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$ 230us-gaap_ShareBasedCompensation
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$ 60us-gaap_ShareBasedCompensation
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| Aggregate intrinsic value of options exercised |
15,495us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
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| Rate of reduced stock-based compensation expense for estimated forfeiture |
6.90%ingn_ShareBasedCompensationExpenseReducedRateForEstimatedForfeiture
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7.00%ingn_ShareBasedCompensationExpenseReducedRateForEstimatedForfeiture
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| Total weighted average fair value of stock options granted |
5,329ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantInPeriodFairValue
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1,705ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantInPeriodFairValue
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95ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantInPeriodFairValue
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| Share-based Compensation, Unrecognized expense, Nonvested Granted Awards |
4,948us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
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1,370us-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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| Common stock reserved for future issuance |
1,216,772us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ 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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276,839us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwelveStockIncentivePlanMember
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| 2012 Plan | Maximum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option exercise price fair value percentage |
100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwelveStockIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| 2012 Plan and 2002 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 |
1,531,258us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ingn_TwentyTwelveAndTwoThousandAndTwoStockIncentivePlanMember
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| 2002 Plan | Contract Termination |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Stock option shares outstanding |
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1,424,540us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwoStockIncentivePlanMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
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| 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 |
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1,424,646us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndTwoStockIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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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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| Common stock reserved for future issuance |
895,346us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| Number of equity awards available for grant |
221,178us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| Stock option shares outstanding |
730,375us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ 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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| Percentage on outstanding shares of common stock |
4.00%ingn_PercentageOnOutstandingCommonStock
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEquityIncentivePlanMember
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| 2014 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_TwoThousandAndFourteenEquityIncentivePlanMember
/ 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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| Number of equity awards available for grant |
148,711us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ 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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| 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 |
$ 134us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= ingn_TwoThousandAndFourteenEmployeeStockPurchasePlanMember
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