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
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Intangible assets at December 31, 2017 $ 14,340  
Amortization expense (690) $ (408)
Intangible assets at March 31, 2018 $ 13,650