Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.21.1
Commitments and Contingencies (Narrative) (Details)
 1 Months Ended 12 Months Ended
Oct. 27, 2017
USD ($)
ft²
Oct. 03, 2014
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2020
USD ($)
Aug. 31, 2018
USD ($)
ft²
Oct. 27, 2017
USD ($)
Jun. 30, 2017
USD ($)
ft²
Oct. 31, 2015
USD ($)
ft²
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 01, 2019
USD ($)
Oct. 30, 2015
Lessee, Operating Lease, Description [Abstract]                        
Operating lease term   15 years                    
Operating lease cost                 $ 3,246,000 $ 3,199,000    
Operating Lease, Expense   $ 2,500,000             2,000,000.0 2,100,000    
Operating lease liabilities     $ 24,740,000           24,740,000 24,700,000    
Operating lease right-of-use asset, net     $ 20,487,000           $ 20,487,000 $ 21,480,000    
New York, NY Office Space [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Lease amount for office space   40,700,000                    
Lease expiration date                 Apr. 30, 2031      
New York, NY Office Space [Member] | TGTX and OPPM [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Lease amount for office space   16,000,000.0                    
New York, NY Office Space [Member] | OPPM [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Operating Lease, Expense   $ 300,000                    
Percentage of Rentable Area   10.00%                    
New York, NY Office Space [Member] | TGTX [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Operating Lease, Expense   $ 1,100,000                    
Percentage of Rentable Area   45.00%                    
Waltham office space [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Operating lease term     2 years           2 years     5 years
Operating lease, area leased | ft²               6,100        
Operating Lease, Expense     $ 200,000         $ 200,000        
Lease expiration date     Mar. 31, 2023                  
Journey [Member] | Scottsdale, Arizona [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Operating lease term             1 year          
Operating lease, area leased | ft²         3,681   2,295          
Operating Lease, Expense       $ 100,000 $ 94,000   $ 55,000          
Lease expiration date       Dec. 31, 2022         Nov. 30, 2020      
Mustang [Member] | Worcester, Massachusetts [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Operating lease, area leased | ft² 27,043                      
Operating Lease, Expense           $ 600,000            
Lease amount for office space           3,600,000            
Lease expiration date                 Oct. 27, 2026      
Security deposit $ 800,000         800,000         $ 1,300,000  
Mustang [Member] | Worcester, Massachusetts [Member] | Cash [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Security deposit 300,000         300,000         300,000  
Mustang [Member] | Worcester, Massachusetts [Member] | Letter of Credit [Member]                        
Lessee, Operating Lease, Description [Abstract]                        
Security deposit $ 500,000         $ 500,000         $ 1,000,000.0