Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Additional Information (Detail)

v3.10.0.1
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Property, Plant and Equipment [Line Items]        
Depreciation     $ 831 $ 543
National Holdings Corporation [Member]        
Property, Plant and Equipment [Line Items]        
Depreciation $ 200 $ 100 300 200
Fortress Biotech Inc [Member]        
Property, Plant and Equipment [Line Items]        
Depreciation $ 300 $ 200 $ 500 $ 400