| Document And Entity Information | Nov. 17, 2021 |
| Document Information [Line Items] | |
| Entity, Registrant Name | Avinger, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Nov. 17, 2021 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 001-36817 |
| Entity, Tax Identification Number | 20-8873453 |
| Entity, Address, Address Line One | 400 Chesapeake Drive |
| Entity, Address, City or Town | Redwood City |
| Entity, Address, State or Province | CA |
| Entity, Address, Postal Zip Code | 94063 |
| City Area Code | 650 |
| Local Phone Number | 241-7900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | AVGR |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001506928 |
