Annual report pursuant to Section 13 and 15(d)

Convertible Preferred Stock - Summary of Non-Redeemable Convertible Preferred Stock (Details)

v2.4.1.9
Convertible Preferred Stock - Summary of Non-Redeemable Convertible Preferred Stock (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Temporary Equity [Line Items]    
Shares authorized 100,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Share issued 66,666us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Series A Nonredeemable Convertible Preferred Stock    
Temporary Equity [Line Items]    
Shares authorized 100,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
 
Share issued 66,666us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
 
Par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
 
Conversion rate 1.01706ingn_RedeemableConvertiblePreferredStockConversionRatio
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
 
Liquidation preference per share $ 3.750us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
 
Dividend rate 5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= ingn_SeriesANonRedeemableConvertiblePreferredStockMember
 
Issue date May 2002