Annual report pursuant to Section 13 and 15(d)

Organization and Description of Business - Additional Information (Detail)

v3.6.0.2
Organization and Description of Business - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Sep. 09, 2016
Dec. 31, 2016
Dec. 01, 2016
Jun. 01, 2016
Apr. 27, 2016
Dec. 31, 2015
Organization And Nature Of Business [Line Items]            
Common Stock Par Or Stated Value Per Share   $ 0.001 $ 2.03 $ 2.40   $ 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 56.60%          
Merger Agreement Termination Fee $ 22.9          
Common Stock Par Or Stated Value Per Share $ 0.02       $ 0.02  
Business Acquisition, Share Price $ 3.25       $ 3.25