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 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Property, Plant and Equipment [Line Items]                
Depreciation         $ 1,379   $ 819  
National Holdings Corporation [Member]                
Property, Plant and Equipment [Line Items]                
Depreciation   $ 200   $ 100   $ 500   $ 300
Fortress Biotech Inc [Member]                
Property, Plant and Equipment [Line Items]                
Depreciation $ 400   $ 200   $ 900   $ 500