Quarterly report pursuant to Section 13 or 15(d)

National Holdings Corporation Acquisition - Intangible Assets - Additional Information (Detail)

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National Holdings Corporation Acquisition - Intangible Assets - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 30, 2017
Mar. 17, 2017
Dec. 31, 2016
Sep. 09, 2016
Common Stock Par Or Stated Value Per Share $ 0.001   $ 0.001  
Goodwill $ 18,645   $ 18,645  
National Holdings Corporation [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 56.60% 56.60%   56.60%
Business Acquisition, Share Price       $ 3.25
Common Stock Par Or Stated Value Per Share       $ 0.02