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

License, Clinical Trial and Sponsored Research Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Research and development - licenses acquired	$ 200	$ 0	$ 650	$ 75
Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	1,670	1,290	3,265	2,680
City of Hope \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	500	500	1,000	1,000
City of Hope - CD 123
Research and development - licenses acquired	0	0	250	0
City of Hope - CD 123 \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	456	114	759	264
City of Hope - IL13Ra2 \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	225	143	567	503
City Of Hope - CS1
Research and development - licenses acquired	200	0	200	0
City of Hope - Manufacturing
Research and development - licenses acquired	0	0	0	75
City of Hope - Manufacturing \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	115	115	229	229
Nationwide Children's Hospital - C134
Research and development - licenses acquired	0	0	200	0
Fred Hutch - CD20 \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	374	418	641	684
BIDMC - CRISPR \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	$ 0	$ 0	$ 69	$ 0