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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 15, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
May 31, 2017
Related Party Transaction [Line Items]          
Proceeds from note payable due to related party     $ 3,000,000    
PDL BioPharma, Inc          
Related Party Transaction [Line Items]          
Expenses from transactions with related party   $ 0 1,585,000    
Expense related to allocation of corporate costs   0   $ 0  
Costs associated with spin-off transaction   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 $ 206,000