Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
3 Months Ended
Mar. 31, 2021
Apr. 30, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Trading Symbol INGN  
Entity Registrant Name INOGEN, INC.  
Entity Central Index Key 0001294133  
Current Fiscal Year End Date --12-31  
Entity Filer Category 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   22,395,360
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 301 Coromar 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