Annual report pursuant to Section 13 and 15(d)

Convertible Preferred Stock - Additional Information (Details)

v2.4.1.9
Convertible Preferred Stock - Additional Information (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Feb. 20, 2014
Dec. 31, 2014
Vote
Dec. 31, 2013
Dec. 31, 2012
Feb. 20, 2014
Mar. 12, 2012
Temporary Equity [Line Items]            
Number of voting rights per share of common stock   1ingn_VotingRightsAssociatedWithEachShareOfCommonStock        
Preferred stock, shares authorized   10,000,000us-gaap_PreferredStockSharesAuthorized 100,000us-gaap_PreferredStockSharesAuthorized      
Preferred stock, shares issued   0us-gaap_PreferredStockSharesIssued 66,666us-gaap_PreferredStockSharesIssued      
Preferred stock, shares outstanding   0us-gaap_PreferredStockSharesOutstanding 66,666us-gaap_PreferredStockSharesOutstanding      
Dividends declared     $ 0us-gaap_DividendsPreferredStockCash $ 0us-gaap_DividendsPreferredStockCash    
Convertible preferred stock, description   Prior to our IPO, each share of preferred stock was automatically convertible into common stock, at the then applicable conversion rate, upon (i) the election of both the holders of a majority of the then-outstanding Series F preferred stock and Series G preferred stock, voting together as a single class provided, or (ii) the closing of an underwritten initial public offering of the Company’s common stock pursuant to a registration statement under the Securities Act of 1933, as amended with aggregate proceeds of at least $40 million at an offering price of at least $17.85 per share (as adjusted for stock splits, stock dividends, recapitalizations, etc.). If the Series G preferred shares were converted to common stock in connection with an initial public offering in which shares are sold to the public at a price that was less than $14.0832 per share (as adjusted for stock splits, stock dividends, recapitalizations, etc.), then immediately prior to such conversion, the applicable conversion rate of the Series G preferred stock was to be increased to the extent necessary to make the Series G preferred holders whole as if the initial public offering price to the public had been equal to $14.0832 (as adjusted for stock splits, stock dividends, recapitalizations, etc.).        
Conversion of preferred stock, shares 14,259,647us-gaap_ConversionOfStockSharesConverted1          
Percentage of convertible preferred stock   Prior to our IPO, the holders of at least 66 2/3% of preferred stock on an as converted to common stock basis were required to approve certain specified actions as outlined in the Company’s prior Certificate of Incorporation. In addition, the holders of at least 60% of the Series D preferred stock were required to approve certain specified actions as outlined in the Company’s prior Certificate of Incorporation. In addition, the Company could not amend its prior Certificate of Incorporation without the approval of at least 66 2/3% of any series of preferred stock if such amendment would change any of the rights, preferences or privileges of such series.        
Common stock            
Temporary Equity [Line Items]            
Proceeds from initial public offering triggering conversion   40,000,000ingn_ProceedsFromIssuanceOfInitialPublicOfferingThatTriggersStockConversion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Share price   17.85us-gaap_SharePrice
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Conversion of preferred stock, shares         14,259,647us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Issuance of common stock in connection with initial public offering, shares   3,529,411us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Percentage of voting rights required to approve certain action   66.67%ingn_PercentageOfVotingRightsRequiredToApproveCertainAction
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Preferred Stock            
Temporary Equity [Line Items]            
Percentage of voting rights required to approve certain action   60.00%ingn_PercentageOfVotingRightsRequiredToApproveCertainAction
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
       
Redeemable convertible preferred stock            
Temporary Equity [Line Items]            
Preferred stock, shares outstanding   0us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
9,541,631us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RedeemableConvertiblePreferredStockMember
     
Series G Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Dividend rate     8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesGRedeemableConvertiblePreferredStockMember
     
Preferred stock, dividend preference   Prior to our IPO, Series G preferred stockholders were entitled to receive dividends prior and in preference to any declaration or payment of any dividend on all existing series of preferred stock and common stock at the rate of 8% of its original issue price.        
Issuance of common stock in connection with initial public offering, shares           2,840,260us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesGRedeemableConvertiblePreferredStockMember
Preferred stock value issued           $ 20,000,000us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesGRedeemableConvertiblePreferredStockMember
Shares issued, price per share           $ 7.0416us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesGRedeemableConvertiblePreferredStockMember
Percentage of voting rights required to approve certain action   66.67%ingn_PercentageOfVotingRightsRequiredToApproveCertainAction
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesGRedeemableConvertiblePreferredStockMember
       
Series G Redeemable Convertible Preferred Stock | Maximum            
Temporary Equity [Line Items]            
Temporary equity, conversion price per share   14.0832ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesGRedeemableConvertiblePreferredStockMember
       
Series F Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Dividend rate     8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesFRedeemableConvertiblePreferredStockMember
     
Preferred stock, dividend preference   Prior to our IPO, subject to the prior rights of the holders of Series G preferred stock, Series F preferred stockholders were entitled to receive dividends prior and in preference to any declaration or payment of any dividend on all existing series of preferred stock and common stock at the rate of 8% of its original issue price.        
Temporary equity, conversion price per share   3.570ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesFRedeemableConvertiblePreferredStockMember
       
Series E Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Dividend rate     8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesERedeemableConvertiblePreferredStockMember
     
Preferred stock, dividend preference   Prior to our IPO, subject to the prior rights of the holders of Series G and F preferred stock, the Series E preferred stockholders were entitled to receive dividends prior and in preference to any declaration or payment of any dividend on Series A, B, C, and D preferred stock and common stock at the rate of 8% of its original issue price.        
Temporary equity, conversion price per share   3.570ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesERedeemableConvertiblePreferredStockMember
       
Series D Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Dividend rate     8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesDRedeemableConvertiblePreferredStockMember
     
Preferred stock, dividend preference   Prior to our IPO, subject to the prior rights of the holders of Series G, F, and E preferred stock, the Series D preferred stockholders were entitled to receive dividends prior and in preference to any declaration or payment of any dividend on Series A, B and C preferred stock and common stock at the rate of 8% of its original issue price        
Temporary equity, conversion price per share   12.651ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesDRedeemableConvertiblePreferredStockMember
       
Series D Redeemable Convertible Preferred Stock | Scenario, Adjustment            
Temporary Equity [Line Items]            
Temporary equity, conversion price per share   11.652ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesDRedeemableConvertiblePreferredStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
       
Series C Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Dividend rate     8.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesCRedeemableConvertiblePreferredStockMember
     
Preferred stock, dividend preference   Prior to our IPO, subject to the prior rights of the holders of Series G, F, E and D preferred stocks, the Series C preferred stockholders were entitled to receive dividends prior and in preference to any declaration or payment of any dividend on Series A and B preferred stock and common stock at the rate of 8% of its original issue price        
Temporary equity, conversion price per share   10.836ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesCRedeemableConvertiblePreferredStockMember
       
Series C Redeemable Convertible Preferred Stock | Scenario, Adjustment            
Temporary Equity [Line Items]            
Temporary equity, conversion price per share   10.161ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesCRedeemableConvertiblePreferredStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
       
Series B Redeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Dividend rate     5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesBRedeemableConvertiblePreferredStockMember
     
Preferred stock, dividend preference   Prior to our IPO, subject to the prior rights of the holders of Series G, F, E, D and C preferred stocks, the Series A and B preferred stockholders were entitled to receive dividends prior and in preference to any declaration or payment of any dividend on common stock at the rate of 5% of its original issue price        
Temporary equity, conversion price per share   8.436ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesBRedeemableConvertiblePreferredStockMember
       
Series B Redeemable Convertible Preferred Stock | Scenario, Adjustment            
Temporary Equity [Line Items]            
Temporary equity, conversion price per share   8.187ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesBRedeemableConvertiblePreferredStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioAdjustmentMember
       
Series A Nonredeemable Convertible Preferred Stock            
Temporary Equity [Line Items]            
Preferred stock, shares authorized     100,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
     
Preferred stock, shares issued     66,666us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
     
Dividend rate     5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
     
Preferred stock, dividend preference   Prior to our IPO, subject to the prior rights of the holders of Series G, F, E, D and C preferred stocks, the Series A and B preferred stockholders were entitled to receive dividends prior and in preference to any declaration or payment of any dividend on common stock at the rate of 5% of its original issue price        
Temporary equity, conversion price per share   3.687ingn_TemporaryEquityConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember