Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol INGN  
Entity Registrant Name Inogen Inc  
Entity Central Index Key 0001294133  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Common Stock, Shares Outstanding   21,998,485
Document Quarterly Report true  
Document Transition Report false  
Title of 12(b) Security Common Stock, $0.001 par value  
Security Exchange Name NASDAQ  
Entity File Number 001-36309  
Entity Tax Identification Number 33-0989359  
Entity Address, Address Line One 326 Bollay Drive  
Entity Address, City or Town Goleta  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 93117  
City Area Code (805)  
Local Phone Number 562-0500  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code DE