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Revenue Interest Obligation - (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2017
May 31, 2017
Dec. 31, 2022
Dec. 31, 2021
Revenue Interest Obligation.        
Debt Instrument [Line Items]        
Interest expense related to revenue interest obligation     $ 2,700 $ 2,700
Ligand Pharmaceuticals        
Debt Instrument [Line Items]        
Estimated present value on the acquisition date $ 27,700 $ 27,700    
Annual minimum sale $ 2,750 $ 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 $ 5,000    
Cumulative sales 100,000 100,000    
Cumulative sales of products exceed $300.0 | Ligand Pharmaceuticals        
Debt Instrument [Line Items]        
Payments due based on cumulative sales 5,000 5,000    
Cumulative sales $ 300,000 $ 300,000