Mustang Bio, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

License, Clinical Trial and Sponsored Research Agreements (Details Textual)

License, Clinical Trial and Sponsored Research Agreements (Details Textual) - USD ($)			1 Months Ended								12 Months Ended
	Aug. 02, 2018	Jul. 03, 2017	Nov. 30, 2017	Nov. 20, 2017	May 31, 2017	Mar. 17, 2017	Feb. 28, 2017	Oct. 31, 2016	Apr. 30, 2015	Mar. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Mar. 17, 2018	Jan. 03, 2018	Nov. 28, 2017	Dec. 31, 2016
Payment Of Upfront Fees					$ 600,000
Revenue Recognition Milestone Method Payments Due	$ 13,500,000				14,900,000
Research And Development Expense, Sponsored Research Payment															$ 800,000
Research and Development Expense											$ 2,100,000
Stock Issued During Period, Value, Purchase of Assets												$ 1,682,000
Proceeds from Issuance of Private Placement								$ 10,000,000
Common Stock, Shares Authorized											50,000,000	50,000,000
Research and development - licenses acquired											$ 3,360,000	$ 12,433,000
Cost of Goods and Services Sold					50,000
UCLA License [Member]
Research and Development Expense											100,000	100,000
Research and development - licenses acquired											0	200,000
Psca Technology License [Member]
Payment Of Upfront Fees					300,000
Revenue Recognition Milestone Method Payments Due					14,900,000
Research and development - licenses acquired											0	300,000
Cost of Goods and Services Sold					50,000
Cs Technology License [Member]
Payment Of Upfront Fees					600,000
Revenue Recognition Milestone Method Payments Due					14,900,000
Research and development - licenses acquired											0	600,000
Cost of Goods and Services Sold					$ 50,000
IL13Ra2 [Member]
Research and Development Expense											1,100,000	1,400,000
Harvard College License [Member]
Payment Of Upfront Fees			$ 300,000
Other Commitment, Due in Next Twelve Months				$ 25,000
Other Commitment, Due in Third Year				100,000
Other Commitment, Due in Second Year				50,000
Development Milestones Method Additional Payments Due				16,700,000
Cost of Goods and Services Sold				$ 25,000
Sponsored Research Agreement [Member]
Research and Development Expense											2,000,000	2,000,000
CD123 CRA [Member]
Research and Development Expense											800,000	1,400,000
St Jude XSCID [Member]
Research and development - licenses acquired											1,000,000	0
Cost of Goods and Services Sold	$ 100,000
University of California [Member]
Development Milestones Method Additional Payments Due						$ 14,300,000
University of California [Member] \| UCLA License [Member]
Payment Of Upfront Fees						200,000
Other Commitment, Due in Next Twelve Months						15,000
Other Commitment, Due in Fifth Year						50,000
Other Commitment, Due in Fourth Year						$ 25,000
City Of Hope [Member]
Payment Of Upfront Fees							$ 100,000
Revenue Recognition Milestone Method Payments Due							100,000
Research And Development Expense, Sponsored Research Payment														$ 900,000
City Of Hope [Member] \| Intellectual Property [Member]
Payment Of Upfront Fees									$ 2,000,000
Revenue Recognition Milestone Method Payments Due												2,000,000
City Of Hope [Member] \| Intellectual Property [Member] \| Maximum [Member]
Royalty Expense												1,000,000
City Of Hope [Member] \| Commitment Two [Member] \| Intellectual Property [Member]
Development Milestones Method Additional Payments Due										$ 14,500,000
City Of Hope [Member] \| AR CD123 License [Member]
Revenue Recognition Milestone Method Payments Due							14,500,000
City Of Hope [Member] \| IL License [Member]
Cost of Goods and Services Sold							25,000
City Of Hope [Member] \| Spacer License [Member]
Cost of Goods and Services Sold							10,000
City Of Hope [Member] \| IL13Ra2 [Member]
Payment Of Upfront Fees							9,300
Revenue Recognition Milestone Method Payments Due							14,500,000
Research And Development Expense, Sponsored Research Payment							200,000
Licensing Arrangements Additional Costs Incurred							100,000
Cost of Goods and Services Sold							25,000
City Of Hope [Member] \| CD123 CRA [Member]
Payment Of Upfront Fees							19,450
Research And Development Expense, Sponsored Research Payment							200,000
Licensing Arrangements Additional Costs Incurred							$ 97,490
City Of Hope [Member] \| Patent and Know-how Rights [Member]
Research And Development Expense, Sponsored Research Payment														$ 75,000
Fred Hutchinson Cancer Research Center [Member]
Research And Development Expense, Sponsored Research Payment													$ 600,000
Fred Hutchinson Cancer Research Center [Member] \| CD20 Technology License [Member]
Payment Of Upfront Fees		$ 300,000
Development Milestones Method Additional Payments Due		39,100,000
Cost of Goods and Services Sold		50,000
Fred Hutchinson Cancer Research Center [Member] \| CD20 Clinical Agreement [Member]
Research And Development Expense, Sponsored Research Payment		$ 5,300,000
Research and Development Expense											$ 1,300,000	600,000
Common Class A [Member]
Stock Issued During Period, Value, Purchase of Assets												$ 0
Common Stock, Shares Authorized																1,000,000
Common Class A [Member] \| City Of Hope [Member]
Stock Issued During Period, Shares, Purchase of Assets								293,588
Common Class A [Member] \| City Of Hope [Member] \| Valuation, Market Approach [Member]
Stock Granted During Period, Value Per Share Determined								$ 5.73
Stock Issued During Period, Value, Purchase of Assets								$ 1,700,000
Common Class A [Member] \| City Of Hope [Member] \| Intellectual Property [Member]
Research and Development Expense										$ 1,000,000
Stock Granted During Period, Valuation Inputs, Weighted Marketability Rate										44.80%
Stock Granted During Period, Valuation Inputs, Weighted Average Cost of Capital										30.00%
Common Class A [Member] \| City Of Hope [Member] \| Intellectual Property [Member] \| Discounted Cash Flow Model [Member]
Stock Granted During Period, Value Per Share Determined										$ 0.147
Stock Issued During Period, Value, Purchase of Assets										$ 100,000