Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Computation of Earnings Per Share (Details)

v2.4.1.9
Summary of Significant Accounting Policies - Computation of Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator—basic:                      
Net income $ 1,519us-gaap_NetIncomeLoss $ 2,133us-gaap_NetIncomeLoss $ 2,286us-gaap_NetIncomeLoss $ 888us-gaap_NetIncomeLoss $ 21,971us-gaap_NetIncomeLoss $ 774us-gaap_NetIncomeLoss $ 1,960us-gaap_NetIncomeLoss $ 730us-gaap_NetIncomeLoss $ 6,826us-gaap_NetIncomeLoss $ 25,435us-gaap_NetIncomeLoss $ 564us-gaap_NetIncomeLoss
Deemed dividend on redeemable convertible preferred stock                 (987)ingn_DeemedDividendOnRedeemableConvertiblePreferredStock (7,278)ingn_DeemedDividendOnRedeemableConvertiblePreferredStock (5,781)ingn_DeemedDividendOnRedeemableConvertiblePreferredStock
Net income (loss) before preferred rights dividend                 5,839ingn_NetIncomeLossAvailableToCommonStockholdersBeforePreferredRightsDividend 18,157ingn_NetIncomeLossAvailableToCommonStockholdersBeforePreferredRightsDividend (5,217)ingn_NetIncomeLossAvailableToCommonStockholdersBeforePreferredRightsDividend
Less preferred rights dividend                   (7,165)us-gaap_PreferredStockDividendsIncomeStatementImpact  
Less: undistributed earnings to preferred stock - basic                 (567)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic (10,781)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic  
Net income (loss) attributable to common stockholders - basic                 5,272ingn_NetIncomeLossAvailableToCommonStockholdersBasicNetOfUndistributedEarningsToPreferredStock 211ingn_NetIncomeLossAvailableToCommonStockholdersBasicNetOfUndistributedEarningsToPreferredStock (5,217)ingn_NetIncomeLossAvailableToCommonStockholdersBasicNetOfUndistributedEarningsToPreferredStock
Numerator—diluted:                      
Net income 1,519us-gaap_NetIncomeLoss 2,133us-gaap_NetIncomeLoss 2,286us-gaap_NetIncomeLoss 888us-gaap_NetIncomeLoss 21,971us-gaap_NetIncomeLoss 774us-gaap_NetIncomeLoss 1,960us-gaap_NetIncomeLoss 730us-gaap_NetIncomeLoss 6,826us-gaap_NetIncomeLoss 25,435us-gaap_NetIncomeLoss 564us-gaap_NetIncomeLoss
Deemed dividend on redeemable convertible preferred stock                 (987)ingn_DeemedDividendOnRedeemableConvertiblePreferredStock (7,278)ingn_DeemedDividendOnRedeemableConvertiblePreferredStock (5,781)ingn_DeemedDividendOnRedeemableConvertiblePreferredStock
Net income (loss) before preferred rights dividend                 5,839ingn_NetIncomeLossAvailableToCommonStockholdersBeforePreferredRightsDividend 18,157ingn_NetIncomeLossAvailableToCommonStockholdersBeforePreferredRightsDividend (5,217)ingn_NetIncomeLossAvailableToCommonStockholdersBeforePreferredRightsDividend
Less preferred rights dividend                   (7,165)us-gaap_PreferredStockDividendsIncomeStatementImpact  
Less undistributed earnings to preferred stock - diluted                 (514)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted (9,625)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted  
Net income (loss) attributable to common stockholders - diluted                 $ 5,325us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 1,367us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (5,217)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator:                      
Weighted-average common shares - basic common stock                 16,182,569us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 276,535us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 261,268us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average common shares - diluted common stock                 18,037,498us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 2,008,156us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 261,268us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per share - basic common stock $ 0.08us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic $ 0.13us-gaap_EarningsPerShareBasic $ (0.01)us-gaap_EarningsPerShareBasic $ 0.91us-gaap_EarningsPerShareBasic $ (3.90)us-gaap_EarningsPerShareBasic   $ (3.65)us-gaap_EarningsPerShareBasic $ 0.33us-gaap_EarningsPerShareBasic $ 0.76us-gaap_EarningsPerShareBasic $ (19.97)us-gaap_EarningsPerShareBasic
Net income (loss) per share - diluted common stock $ 0.07us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ 0.11us-gaap_EarningsPerShareDiluted $ (0.01)us-gaap_EarningsPerShareDiluted $ 0.79us-gaap_EarningsPerShareDiluted $ (3.90)us-gaap_EarningsPerShareDiluted   $ (3.65)us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted $ 0.68us-gaap_EarningsPerShareDiluted $ (19.97)us-gaap_EarningsPerShareDiluted
Shares excluded from diluted income (loss)                      
Shares excluded from diluted net income (loss)                 546,142us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount   15,937,343us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Basic common shares                 16,182,569us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 276,535us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 261,268us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Warrants                 128,016us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 219,766us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants  
Stock Options                 1,726,913us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,511,855us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements  
Diluted common shares                 18,037,498us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 2,008,156us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 261,268us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Warrants                      
Shares excluded from diluted income (loss)                      
Shares excluded from diluted net income (loss)                     233,611us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
Stock Options                      
Shares excluded from diluted income (loss)                      
Shares excluded from diluted net income (loss)                 546,142us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
  1,646,223us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Preferred Convertible Stock                      
Shares excluded from diluted income (loss)                      
Shares excluded from diluted net income (loss)                     14,057,509us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember