| Document and Entity Information | Oct. 27, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 27, 2021 |
| Entity File Number | 001-36333 |
| Entity Registrant Name | BIO-PATH HOLDINGS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 87-0652870 |
| Entity Address State Or Province | TX |
| Entity Address, Address Line One | 4710 Bellaire Boulevard |
| Entity Address, Adress Line Two | Suite 210 |
| Entity Address, City or Town | Bellaire |
| Entity Address, Postal Zip Code | 77401 |
| City Area Code | 832 |
| Local Phone Number | 742-1357 |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | BPTH |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001133818 |
| Amendment Flag | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
