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, 2019	Mar. 31, 2018
Research and development - licenses acquired	$ 450	$ 75
Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	1,595	1,390
City of Hope [Member] \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	500	500
City of Hope - CD 123 [Member]
Research and development - licenses acquired	250	0
City of Hope - CD 123 [Member] \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	303	150
City of Hope - IL13Ra2 [Member] \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	342	360
City of Hope - Manufacturing [Member]
Research and development - licenses acquired	0	75
City of Hope - Manufacturing [Member] \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	114	114
Nationwide Children's Hospital - C134 [Member]
Research and development - licenses acquired	200	0
Fred Hutch - CD20 [Member] \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	267	266
BIDMC - CRISPR [Member] \| Sponsored Research And Clinical Trial Agreements [Member]
Research and development - licenses acquired	$ 69	$ 0