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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 15, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
May 31, 2017
Related Party Transaction [Line Items]              
Proceeds from note payable due to related party         $ 10,400,000    
PDL BioPharma, Inc              
Related Party Transaction [Line Items]              
Expenses from transactions with related party   $ 0 $ 1,165,000 $ 0 2,750,000    
Expense related to allocation of corporate costs   0   0   $ 0  
Costs associated with spin-off transaction   0 0 0 0    
Maximum aggregate principal amount $ 32,600,000           $ 25,600,000
Line of credit limit increased amount $ 7,000,000            
Proceeds from note payable due to related party           $ 12,400,000  
Interest expense   $ 0 $ 272,000 $ 0 $ 478,000