| Document and Entity Information | May 06, 2021 |
| Document and Entity Information | |
| Entity Registrant Name | COHERUS BIOSCIENCES, INC. |
| Document Type | 8-K |
| Entity File Number | 001-36721 |
| Entity Tax Identification Number | 27-3615821 |
| Document Period End Date | May 6, 2021 |
| Entity Address, Address Line One | 333 Twin Dolphin Drive |
| Entity Address, Address Line Two | Suite 600 |
| Entity Address, Postal Zip Code | 94065 |
| City Area Code | 650 |
| Local Phone Number | 649-3530 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Issuer Tender Offer | false |
| Pre-commencement Tender Offer | false |
| Amendment Flag | false |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | CHRS |
| Security Exchange Name | NASDAQ |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, City or Town | Redwood City |
| Entity Address, State or Province | CA |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001512762 |
