Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Details)

v3.20.1
Related Party Transactions - Additional Information (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
item
Related Party Transaction [Line Items]      
Revenue - related party $ 972,000 $ 352,000  
Number Of Separate Notes | item     3
Payments of Loan Costs 26,000 $ 0  
Total notes payable, long-term $ 89,742,000   $ 89,742,000
Debt Instrument, Interest Rate, Stated Percentage 2.50%    
2019 Notes (formerly the Opus Credit Facility Agreement)      
Related Party Transaction [Line Items]      
Common Shares Issued For Opus Debt, In Shares | shares 60,245 131,353  
Common Shares Issued For Opus Debt, Issue Price | $ / shares $ 2.58 $ 2.14  
Payments of Loan Costs $ 200,000 $ 300,000  
Total notes payable, long-term     9,000,000
Debt Instrument, Interest Rate, Stated Percentage 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 11.90%    
Executives Vice Chairman [Member]      
Related Party Transaction [Line Items]      
Interest own in percent by principal stockholder or director 13.00%    
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     2,900,000
Fortress's Executive Vice President, Strategic Development (Michael S. Weiss) [Member]      
Related Party Transaction [Line Items]      
Total notes payable, long-term     2,300,000
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     $ 2,300,000
Shared Services Agreement [Member] | TG Therapeutics, Inc [Member]      
Related Party Transaction [Line Items]      
Revenue - related party $ 100,000 $ 100,000  
Due from Related Parties, Current 36,000    
Desk Share Agreements [Member]      
Related Party Transaction [Line Items]      
Payments for Rent 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    
Desk Share Agreements [Member] | OPPM [Member]      
Related Party Transaction [Line Items]      
Revenue - related party 0    
Due from Related Parties, Current $ 400,000