Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.10.0.1
Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Feb. 02, 2018
Related Party Transaction [Line Items]          
Lease Sharing Agreements Contributions To Property Under Lease     $ 96,000    
Description Of Fee Paid     NSC received a fee of approximately $1.8 million, or 8% on the gross proceeds raised of $23.0 million. The fees were eliminated in consolidation.    
Proceeds from Other Debt     $ 21,707,000 $ 0  
Noninterest Expense Transfer Agent and Custodian Fees     $ 1,700,000    
National Holdings Corporation [Member]          
Related Party Transaction [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired 56.30%   56.30%    
Opus Credit Facility [Member]          
Related Party Transaction [Line Items]          
Payments of Loan Costs     $ 300,000 500,000  
Debt Instrument, Interest Rate, Stated Percentage 12.00%   12.00%    
Chief Executive Officer [Member]          
Related Party Transaction [Line Items]          
Interest own in percent by principal stockholder or director 13.70%   13.70%    
Board of Directors Chairman [Member] | National Holdings Corporation [Member]          
Related Party Transaction [Line Items]          
Equity Method Investment, Ownership Percentage 4.60%   4.60%    
TG Therapeutics, Inc [Member]          
Related Party Transaction [Line Items]          
Due from Related Parties, Current $ 43,000   $ 43,000    
Checkpoint [Member] | Chord Advisors, LLC [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Expenses from Transactions with Related Party   $ 0      
Founders Agreement [Member] | Avenue Therapeutics, Inc. [Member]          
Related Party Transaction [Line Items]          
Other Fee,Percentage     2.50%    
OPPM [Member]          
Related Party Transaction [Line Items]          
Payments for Rent     $ 42,000    
Due from Related Parties, Current $ 10,000   $ 10,000    
Executives Vice Chairman [Member]          
Related Party Transaction [Line Items]          
Interest own in percent by principal stockholder or director 16.00%   16.00%    
Collaborative Agreements with TGTX [Member]          
Related Party Transaction [Line Items]          
Proceeds from Option Fee         $ 50,000
Desk Share Agreements [Member]          
Related Party Transaction [Line Items]          
Payments for Rent     $ 600,000    
Desk Share Agreements [Member] | TG Therapeutics, Inc [Member]          
Related Party Transaction [Line Items]          
Due from Related Parties, Current $ 0   0    
Desk Share Agreements [Member] | OPPM [Member]          
Related Party Transaction [Line Items]          
Due from Related Parties, Current 94,000   94,000    
Shared Services Agreement [Member] | TG Therapeutics, Inc [Member]          
Related Party Transaction [Line Items]          
Proceeds from Related Party Agreement 700,000 $ 400,000 1,000,000 $ 600,000  
Due from Related Parties $ 400,000   $ 400,000