Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Property and Equipment - Components of Property and Equipment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 14,878 $ 14,583
Less: Accumulated depreciation (3,045) (2,564)
Property and equipment, net 11,833 12,019
Computer Equipment [Member] | Fortress Biotech Inc [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 648 648
Useful Life (Years) 3 years  
Furniture and Fixtures [Member] | Fortress Biotech Inc [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 1,142 1,128
Useful Life (Years) 5 years  
Leasehold Improvements [Member] | Fortress Biotech Inc [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 9,359 9,271
Leasehold Improvements [Member] | Fortress Biotech Inc [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (Years) 15 years  
Leasehold Improvements [Member] | Fortress Biotech Inc [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Useful Life (Years) 5 years  
Construction in progress [Member] | Fortress Biotech Inc [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment [1] $ 487 393
Machinery and Equipment [Member] | Fortress Biotech Inc [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 3,242 $ 3,143
Useful Life (Years) 5 years  
[1] Relates to the Mustang cell processing facility.