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Stock Incentive Plans - Summary of Stock Options Activity (Details) (USD $)
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3 Months Ended | 12 Months Ended |
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Mar. 31, 2015
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Dec. 31, 2014
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Stock Options Outstanding, Beginning balance | 2,261,633us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | |
| Stock Options, Exercised | (204,332)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | |
| Stock Options, Forfeited | (2,125)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | |
| Stock Options Outstanding, Ending balance | 2,055,176us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 2,261,633us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
| Stock Options, Vested and exercisable | 972,304us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber | |
| Stock Options, Vested and expected to vest | 1,954,508us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber | |
| Outstanding, Weighted average exercise price, Beginning balance | $ 7.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | |
| Weighted average exercise price, Exercised | $ 0.81us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | |
| Weighted average exercise price, Forfeited | $ 16.62us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | |
| Outstanding, Weighted average exercise price, Ending balance | $ 7.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 7.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
| Weighted average exercise price, Vested and exercisable | $ 2.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice | |
| Weighted average exercise price, Vested and expected to vest | $ 7.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice | |
| Remaining weighted average contractual term, Outstanding | 6 years 4 months 2 days | 6 years 5 months 5 days |
| Remaining weighted average contractual term, Vested and exercisable | 5 years 9 months 18 days | |
| Remaining weighted average contractual term, Vested and expected to vest | 6 years 3 months 15 days | |
| Outstanding, Per share average intrinsic value | $ 24.04ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodIntrinsicValuePerShare | $ 24.06ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodIntrinsicValuePerShare |
| Per share average intrinsic value, Vested and exercisable | $ 29.41ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsVestedAndExercisablePerShareAverageIntrinsicValue | |
| Per share average intrinsic value, Vested and expected to vest | $ 24.12ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsVestedAndExpectedToVestPerShareAverageIntrinsicValue | |
| Minimum | ||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Outstanding, Price per share, Beginning balance |
$ 0.60ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceOfShares / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Price per share, Exercised |
$ 0.60ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceExercised / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Outstanding, Price per share, Ending balance |
$ 0.60ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceOfShares / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Price per share, Vested and exercisable |
$ 0.60ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceVestedAndExercisable / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Price per share, Vested and expected to vest |
$ 0.60ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceVestedAndExpectedToVest / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Maximum | ||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Outstanding, Price per share, Beginning balance |
$ 24.52ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceOfShares / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Price per share, Exercised |
$ 8.37ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceExercised / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Price per share, Forfeited |
$ 16.62ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceForfeited / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Outstanding, Price per share, Ending balance |
$ 24.52ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceOfShares / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Price per share, Vested and exercisable |
$ 18.93ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceVestedAndExercisable / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Price per share, Vested and expected to vest |
$ 24.52ingn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerSharePriceVestedAndExpectedToVest / us-gaap_RangeAxis = us-gaap_MaximumMember |
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- Definition
Share based compensation arrangement by share based payment award equity instruments vested and exercisable per share average intrinsic value. No definition available.
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- Definition
Share based compensation arrangement by share based payment award equity instruments vested and expected to vest per share average intrinsic value. No definition available.
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- Definition
Share based compensation arrangement by share based payment award options grants in period intrinsic value per share. No definition available.
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- Definition
Share based compensation arrangement by share based payment award per share price exercised. No definition available.
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- Definition
Share based compensation arrangement by share based payment award per share price forfeited. No definition available.
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- Definition
Share based compensation arrangement by share based payment award per share price of shares. No definition available.
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- Definition
Share based compensation arrangement by share based payment award per share price vested and exercisable. No definition available.
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- Definition
Share based compensation arrangement by share based payment award per share price vested and expected to vest. No definition available.
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- Details
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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