Quarterly report pursuant to Section 13 or 15(d)

National Holdings Corporation Acquisition - Intangible Assets - future amortization of these intangible assets (Detail)

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National Holdings Corporation Acquisition - Intangible Assets - future amortization of these intangible assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Total $ 15,983 $ 17,408
National Holdings Corporation [Member]    
Three Months Ended December 31, 2017 415  
Year Ended December 31, 2018 1,649  
Year Ended December 31, 2019 1,649  
Year Ended December 31, 2020 1,654  
Year Ended December 31, 2021 1,649  
Thereafter 7,740  
Total $ 14,756