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
	Mar. 31, 2018	Mar. 31, 2017
Research and development - licenses acquired	$ 75	$ 575
Sponsored Research and Clinical Trial Agreements [Member]
Research and development - licenses acquired	1,390	529
Manufacturing [Member]
Research and development - licenses acquired	75	0
Manufacturing [Member] \| Sponsored Research and Clinical Trial Agreements [Member]
Research and development - licenses acquired	114	0
IL13Ra2 [Member]
Research and development - licenses acquired	0	250
IL13Ra2 [Member] \| Sponsored Research and Clinical Trial Agreements [Member]
Research and development - licenses acquired	360	9
IV/ICV [Member]
Research and development - licenses acquired	0	125
UCLA [Member]
Research and development - licenses acquired	0	200
Fred Hutch CD20 [Member] \| Sponsored Research and Clinical Trial Agreements [Member]
Research and development - licenses acquired	266	0
CD123 [Member] \| Sponsored Research and Clinical Trial Agreements [Member]
Research and development - licenses acquired	150	20
City Of Hope [Member] \| Sponsored Research and Clinical Trial Agreements [Member]
Research and development - licenses acquired	$ 500	$ 500