Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

v3.6.0.2
Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Line Items]    
Deferred Tax Assets, Valuation Allowance $ 94,688 $ 66,730
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 28,000,000  
National Holdings Corporation [Member]    
Income Tax Disclosure [Line Items]    
Deferred Tax Assets, Valuation Allowance 8,800,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Income Tax Payable, Current 400,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets, Current 8,800,000  
Deferred Tax Liabilities, Net, Current 3,200,000  
Domestic Tax Authority [Member]    
Income Tax Disclosure [Line Items]    
Operating Loss Carryforwards 197,500,000  
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 6,300,000  
State and Local Jurisdiction [Member]    
Income Tax Disclosure [Line Items]    
Operating Loss Carryforwards $ 189,500,000