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

Segment Information - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	$ 981	$ 0	$ 1,364	$ 0
Customer One [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	300		600
Accounts Receivable, Net	400		400
Customer Two [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	300		300
Accounts Receivable, Net	400		400
Customer Three [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net	300		300
Accounts Receivable, Net	$ 100		$ 100