Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Components of Property and Equipment (Detail)

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Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 09, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property and equipment, net $ 6,957 $ 1,132 $ 309
Fortress Biotech Inc [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment 6,121   377
Less: Accumulated depreciation (296)   (68)
Property and equipment, net 5,825   309
Computer Equipment [Member] | Fortress Biotech Inc [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 436   13
Useful Life (Years) 3 years    
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   65  
Furniture and Fixtures [Member] | Fortress Biotech Inc [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 788   69
Useful Life (Years) 5 years    
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   $ 259  
Leasehold Improvements [Member] | Fortress Biotech Inc [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment $ 164   21
Useful Life (Years) 5 years    
Construction in progress [Member] | Fortress Biotech Inc [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment [1] $ 4,733   $ 274
Useful Life (Years) [1] 15 years    
[1] For build-out of the Company's new office in New York, NY.