Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business - Additional Information (Detail)

v3.5.0.2
Organization and Description of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Sep. 09, 2016
Sep. 30, 2016
Apr. 27, 2016
Dec. 31, 2015
Organization And Nature Of Business [Line Items]        
Common Stock Par Or Stated Value Per Share   $ 0.001   $ 0.001
National Holdings Corporation [Member]        
Organization And Nature Of Business [Line Items]        
Merger Agreement, Minimum percentage of Shares in Tender Offer to Completed Merger 56.00%      
Business Acquisition, Share Price $ 3.25   $ 3.25  
Merger Agreement Termination Fee $ 22.9      
Common Stock Par Or Stated Value Per Share $ 0.02   $ 0.02