Quarterly report pursuant to Section 13 or 15(d)

National Holdings Corporation Acquisition - Intangible Assets - Amortization is calculated using the straight-line method over the estimated useful lives (Detail)

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National Holdings Corporation Acquisition - Intangible Assets - Amortization is calculated using the straight-line method over the estimated useful lives (Detail) - National Holdings Corporation [Member]
9 Months Ended
Sep. 30, 2018
Trademark [Member]  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years
Customer Lists [Member]  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years
Software license [Member]  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years