Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.20.1
Commitments and Contingencies - Additional Information (Detail)
€ in Millions
 1 Months Ended 12 Months Ended
Jul. 12, 2018
USD ($)
Oct. 03, 2014
USD ($)
Aug. 31, 2018
USD ($)
ft²
Oct. 27, 2017
USD ($)
ft²
Jun. 30, 2017
USD ($)
ft²
Oct. 31, 2015
USD ($)
ft²
Oct. 30, 2015
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 20, 2012
EUR (€)
Property, Plant and Equipment [Line Items]                    
Land Subject to Ground Leases | ft²     3,681   2,295 6,100        
Operating Leases, Rent Expense   $ 2,500,000     $ 55,000 $ 200,000   $ 2,100,000 $ 1,700,000  
Lease Expiration Period             5 years      
Lease amount for office space   40,700,000                
Net rent amount for lease term   $ 16,000,000                
Lease Expiration Date               Nov. 30, 2020    
Operating Lease, Liability               $ 25,496,000    
Operating lease right-of-use asset, net               21,480,000 0  
Loss Contingency, Damages Sought, Value $ 3,300,000                  
Accounts Payable and Accrued Liabilities, Current               35,451,000 $ 34,067,000  
Administration Fee Payable               39,500    
Operating Leases, Rent Expense, Minimum Rentals     $ 94,000              
Operating Lease, Expense               3,200,000    
New York, NY office space [Member]                    
Property, Plant and Equipment [Line Items]                    
Lease Expiration Period   15 years                
OPPM [Member]                    
Property, Plant and Equipment [Line Items]                    
Operating Leases, Rent Expense   $ 300,000                
Percentage of Rentable Area   10.00%                
TG Therapeutics, Inc [Member]                    
Property, Plant and Equipment [Line Items]                    
Operating Leases, Rent Expense   $ 1,100,000                
Percentage of Rentable Area   45.00%                
Mustang [Member]                    
Property, Plant and Equipment [Line Items]                    
Land Subject to Ground Leases | ft²       27,043            
Operating Leases, Rent Expense       $ 600,000            
Operating Leases, Rent Expense, Sublease Rentals       3,600,000            
Security Deposit       800,000            
Mustang [Member] | Fully Occupied [Member]                    
Property, Plant and Equipment [Line Items]                    
Security Deposit       1,300,000            
Mustang [Member] | Cash [Member]                    
Property, Plant and Equipment [Line Items]                    
Security Deposit       300,000            
Mustang [Member] | Cash [Member] | Fully Occupied [Member]                    
Property, Plant and Equipment [Line Items]                    
Security Deposit       300,000            
Mustang [Member] | LOC Fees [Member]                    
Property, Plant and Equipment [Line Items]                    
Security Deposit       500,000            
Mustang [Member] | LOC Fees [Member] | Fully Occupied [Member]                    
Property, Plant and Equipment [Line Items]                    
Security Deposit       $ 1,000,000            
Dr.Falk Pharma [Member]                    
Property, Plant and Equipment [Line Items]                    
Contractual Obligation | €                   € 2.5
Accounts Payable and Accrued Liabilities, Current               $ 300,000