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Fair Value Measurements - Summary of Quantitative Information about Level 3 Inputs for Fair Value Measurement of Earnout Liability (Details) - Level 3	Sep. 30, 2020	Dec. 31, 2019
Revenue Volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Earnout liability, measurement input	35.00	35.00
WACC
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Earnout liability, measurement input	12.00	13.00
20-Year Risk Free Rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Earnout liability, measurement input	1.23	2.25
Market Price of Risk
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Earnout liability, measurement input	8.00	10.00

X

- Definition

Earnout liability measurement input.

+ References

No definition available.

+ Details

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Namespace Prefix:	ingn_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=ingn_MeasurementInputWeightedAverageCostOfCapitalMember
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X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=ingn_MeasurementInputTwentyYearRiskFreeRateMember
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X

- Details

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