Fortress Biotech, Inc. Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	$ 429,000	$ 0	$ 1,793,000	$ 0
Customer One [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	200,000		800,000
Accounts Receivable, Net	100,000		100,000
Customer Two [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	43,000		300,000
Accounts Receivable, Net	71,000		71,000
Customer Three [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net			300,000
Accounts Receivable, Net	$ 50,000		$ 50,000