| Document And Entity Information | Feb. 25, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 25, 2020 |
| Entity Registrant Name | INOGEN, INC. |
| Entity Central Index Key | 0001294133 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-36309 |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock, $0.001 par value |
| Trading Symbol | INGN |
| Security Exchange Name | NASDAQ |
