| Document and Entity Information | Jan. 31, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 31, 2022 |
| Entity Registrant Name | Ocuphire Pharma, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-34079 |
| Entity Tax Identification Number | 11-3516358 |
| Entity Address, Address Line One | 3700 Grand River Avenue, Suite 1200 |
| Entity Address, City or Town | Farmington Hills |
| Entity Address, State or Province | MI |
| Entity Address, Postal Zip Code | 48335 |
| City Area Code | 248 |
| Local Phone Number | 681-9815 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001228627 |
| Title of 12(b) Security | Common Stock, $0.0001 par value |
| Trading Symbol | OCUP |
| Security Exchange Name | NASDAQ |
