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Revenue Interest Obligation - (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2017
Mar. 31, 2022
Mar. 31, 2021
Revenue Interest Obligation.      
Debt Instrument [Line Items]      
Interest expense related to revenue interest obligation   $ 700 $ 700
Ligand Pharmaceuticals      
Debt Instrument [Line Items]      
Estimated present value on the acquisition date $ 27,700    
Annual minimum sale $ 2,750    
Percentage of future sales 5.00%    
Term of agreement 10 years    
Cumulative sales of products exceed $100.0 | Ligand Pharmaceuticals      
Debt Instrument [Line Items]      
Payments due based on cumulative sales $ 5,000    
Cumulative sales 100,000    
Cumulative sales of products exceed $300.0 | Ligand Pharmaceuticals      
Debt Instrument [Line Items]      
Payments due based on cumulative sales 5,000    
Cumulative sales $ 300,000