Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Details)

v3.20.2
Related Party Transactions - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 12, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]            
Revenue - related party   $ 42,000 $ 1,051,000 $ 1,014,000 $ 1,403,000  
Payments of Loan Costs       26,000 $ 23,000  
Total notes payable, long-term   $ 89,742,000   $ 89,742,000   $ 89,742,000
Debt Instrument, Interest Rate, Stated Percentage   2.50%   2.50%    
Opus Credit Facility [Member]            
Related Party Transaction [Line Items]            
Common Shares Issued For Opus Debt, In Shares       60,245 78,811  
Common Shares Issued For Opus Debt, Issue Price       $ 2.58 $ 2.14  
2019 Notes (formerly the Opus Credit Facility Agreement)            
Related Party Transaction [Line Items]            
Common Shares Issued For Opus Debt, In Shares       56,653 91,510  
Common Shares Issued For Opus Debt, Issue Price       $ 2.78 $ 1.88  
Payments of Loan Costs       $ 300,000 $ 300,000  
Total notes payable, long-term           9,000,000.0
Debt Instrument, Interest Rate, Stated Percentage   12.00%   12.00%    
DAK Capital Inc [Member] | 2019 Notes (formerly the Opus Credit Facility Agreement)            
Related Party Transaction [Line Items]            
Total notes payable, long-term           3,800,000
Chief Executive Officer [Member]            
Related Party Transaction [Line Items]            
Interest own in percent by principal stockholder or director   11.00%   11.00%    
Executives Vice Chairman [Member]            
Related Party Transaction [Line Items]            
Interest own in percent by principal stockholder or director   11.90%   11.90%    
Fortress's Chairman, President and Chief Executive Officer (Lindsay A. Rosenwald) [Member] | 2019 Notes (formerly the Opus Credit Facility Agreement)            
Related Party Transaction [Line Items]            
Total notes payable, long-term           300,000
Fortress's Executive Vice President, Strategic Development (Michael S. Weiss) [Member] | 2019 Notes (formerly the Opus Credit Facility Agreement)            
Related Party Transaction [Line Items]            
Total notes payable, long-term           2,000,000.0
Credit Facility Provided | Avenue            
Related Party Transaction [Line Items]            
Maximum borrowing capacity $ 2,000,000          
Maximum aggregate lending up agreement 800,000          
Aggregate lending up agreement $ 1,200,000          
Interest rate per annum (as a percent) 7.00%          
Repayment period following the termination of the SPMA 30 days          
Amounts drawn $ 0          
Dr Rosenwald and Mr Weiss | 2019 Notes (formerly the Opus Credit Facility Agreement)            
Related Party Transaction [Line Items]            
Total notes payable, long-term           $ 2,900,000
Shared Services Agreement [Member] | TG Therapeutics, Inc [Member]            
Related Party Transaction [Line Items]            
Revenue - related party   $ 100,000 100,000 $ 200,000 200,000  
Due from Related Parties, Current   69,000   69,000    
Desk Share Agreements [Member]            
Related Party Transaction [Line Items]            
Payments for Rent   700,000 700,000      
Desk Share Agreements [Member] | TG Therapeutics, Inc [Member]            
Related Party Transaction [Line Items]            
Revenue - related party       400,000    
Due from Related Parties, Current   100,000   100,000    
Desk Share Agreements [Member] | OPPM [Member]            
Related Party Transaction [Line Items]            
Revenue - related party   0 $ 100,000   $ 400,000  
Due from Related Parties, Current   $ 400,000   $ 400,000