Quarterly report pursuant to Section 13 or 15(d)

National Holdings Corporation Acquisition - Intangible Assets - gross carrying amounts related to acquired intangible assets (Detail)

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National Holdings Corporation Acquisition - Intangible Assets - gross carrying amounts related to acquired intangible assets (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Intangible assets at December 31, 2017 $ 14,340  
Addition 45  
Amortization expense (1,388) $ (819)
Intangible assets at June 30, 2018 $ 12,997