| Document and Entity Information | Jul. 28, 2023 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 28, 2023 |
| Entity File Number | 001-38191 |
| Entity Registrant Name | Mustang Bio, Inc. |
| Entity Central Index Key | 0001680048 |
| Entity Tax Identification Number | 47-3828760 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 377 Plantation Street |
| Entity Address, City or Town | Worcester |
| Entity Address State Or Province | MA |
| Entity Address, Postal Zip Code | 01605 |
| City Area Code | 781 |
| Local Phone Number | 652-4500 |
| 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 per share |
| Trading Symbol | MBIO |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
