Mustang Bio, Inc. Quarterly report pursuant to Section 13 or 15(d)

Clinical Trial and Sponsored Research Agreements (City of Hope - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details)

Clinical Trial and Sponsored Research Agreements (City of Hope - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details) - USD ($) $ in Thousands			1 Months Ended							3 Months Ended		9 Months Ended
	Sep. 08, 2021	Jul. 03, 2017	Nov. 30, 2022	Jan. 31, 2022	Nov. 30, 2020	Oct. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Feb. 28, 2017	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
License, Clinical Trial and Sponsored Research Agreements
Research and development expense										$ 9,477	$ 15,419	$ 34,313	$ 46,872
Mayo Clinic [Member]
License, Clinical Trial and Sponsored Research Agreements
Total reimbursement payments made										2,200		2,200
PSCA (MB-105) [Member] \| City of Hope National Medical Center ("COH") [Member]
License, Clinical Trial and Sponsored Research Agreements
Total reimbursement payments made										500		500
HER2 (MB 103) [Member] \| City of Hope National Medical Center ("COH") [Member]
License, Clinical Trial and Sponsored Research Agreements
Total reimbursement payments made										3,000		3,000
CD20 (MB-106) [Member] \| Fred Hutchinson Cancer Center [Member]
License, Clinical Trial and Sponsored Research Agreements
Total reimbursement payments made										8,400		8,400
ST. Jude - XSCID [Member] \| St. Jude Children's Research Hospital [Member]
License, Clinical Trial and Sponsored Research Agreements
Total reimbursement payments made										3,500		3,500
IL13Ra2 CAR and (C134) [Member]
License, Clinical Trial and Sponsored Research Agreements
Research and development expense			$ 600			$ 300
Sponsored Research and Clinical Trial Agreements [Member]
License, Clinical Trial and Sponsored Research Agreements
Research and development expense										364	1,836	3,739	4,884
Sponsored Research and Clinical Trial Agreements [Member] \| Mayo Clinic [Member]
License, Clinical Trial and Sponsored Research Agreements
Research and development expense											269	551	731
Sponsored Research and Clinical Trial Agreements [Member] \| CD123 (MB-102) [Member] \| City of Hope National Medical Center ("COH") [Member]
License, Clinical Trial and Sponsored Research Agreements
Contribution per patient									$ 100
Research and development expense										23	63	23	165
Sponsored Research and Clinical Trial Agreements [Member] \| IL13Ra2 (MB-101) [Member] \| City of Hope National Medical Center ("COH") [Member]
License, Clinical Trial and Sponsored Research Agreements
Contribution toward patient costs									$ 100
Contribution per patient						100
Research and development expense										180	192	817	654
Annual maintenance fee payable						200
Sponsored Research and Clinical Trial Agreements [Member] \| IL13Ra2 (MB-101) [Member] \| City of Hope National Medical Center ("COH") [Member] \| Maximum
License, Clinical Trial and Sponsored Research Agreements
Contribution toward patient costs												200
Sponsored Research and Clinical Trial Agreements [Member] \| CS1 (MB-104) [Member] \| City of Hope National Medical Center ("COH") [Member]
License, Clinical Trial and Sponsored Research Agreements
Research and development expense											187	188	287
Total reimbursement payments made										2,200		2,200
Sponsored Research and Clinical Trial Agreements [Member] \| CS1 (MB-104) [Member] \| City of Hope National Medical Center ("COH") [Member] \| Maximum
License, Clinical Trial and Sponsored Research Agreements
Milestones payable								$ 2,400
Sponsored Research and Clinical Trial Agreements [Member] \| PSCA (MB-105) [Member] \| City of Hope National Medical Center ("COH") [Member]
License, Clinical Trial and Sponsored Research Agreements
Research and development expense											27	44	77
Sponsored Research and Clinical Trial Agreements [Member] \| PSCA (MB-105) [Member] \| City of Hope National Medical Center ("COH") [Member] \| Maximum
License, Clinical Trial and Sponsored Research Agreements
Milestones payable						$ 2,300
Sponsored Research and Clinical Trial Agreements [Member] \| HER2 (MB 103) [Member] \| City of Hope National Medical Center ("COH") [Member]
License, Clinical Trial and Sponsored Research Agreements
Research and development expense											691	0	1,233
Sponsored Research and Clinical Trial Agreements [Member] \| HER2 (MB 103) [Member] \| City of Hope National Medical Center ("COH") [Member] \| Maximum
License, Clinical Trial and Sponsored Research Agreements
Milestones payable							$ 3,000
Sponsored Research and Clinical Trial Agreements [Member] \| CD20 (MB-106) [Member] \| Fred Hutchinson Cancer Center [Member]
License, Clinical Trial and Sponsored Research Agreements
Milestones payable		$ 5,300
Additional milestone payments				$ 2,200	$ 1,800
Contribution toward patient costs					$ 800
Research and development expense										142	132	1,239	978
Sponsored Research and Clinical Trial Agreements [Member] \| CD20 (MB-106) [Member] \| Fred Hutchinson Cancer Center [Member] \| Maximum
License, Clinical Trial and Sponsored Research Agreements
Additional milestone payments				$ 9,300
Sponsored Research and Clinical Trial Agreements [Member] \| RAG1 SCID (MB-110) [Member] \| Leiden University Medical Centre [Member]
License, Clinical Trial and Sponsored Research Agreements
Agreement term	5 years
Research and development expense										$ 125	$ 92	$ 349	$ 357
Annual maintenance fee payable	$ 500