Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Schedule Of Interest Expenses For Debt Arrangements (Detail)

v3.6.0.2
Property and Equipment - Schedule Of Interest Expenses For Debt Arrangements (Detail) - USD ($)
$ in Thousands
 1 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Gross $ 1,200    
Less: Accumulated depreciation (36)    
Property Plant And Equipment Net 1,164 $ 7,376 $ 309
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Gross 600    
Furniture And Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Gross 65    
Leaseholds And Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Gross 259    
Assets Held under Capital Leases [Member]      
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Gross $ 276    
National Holdings Corporation [Member] | Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Useful Life 5 years    
National Holdings Corporation [Member] | Furniture And Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Useful Life 5 years    
National Holdings Corporation [Member] | Leaseholds And Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives Lesser of useful life or term of lease    
National Holdings Corporation [Member] | Assets Held under Capital Leases [Member]      
Property, Plant and Equipment [Line Items]      
Property Plant And Equipment Useful Life 5 years