| Cover | Mar. 31, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 31, 2021 |
| Entity Registrant Name | ROCKWELL MEDICAL, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 000-23661 |
| Entity Tax Identification Number | 38-3317208 |
| Entity Addresses [Line Items] | |
| Entity Address, Address Line One | 30142 S. Wixom Avenue |
| Entity Address, City or Town | Wixom |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48393 |
| City Area Code | 248 |
| Local Phone Number | 960-9009 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 |
| Trading Symbol | RMTI |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001041024 |
| Amendment Flag | false |
