Annual report pursuant to Section 13 and 15(d)

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)

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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jan. 31, 2010
USD ($)
agreement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of CVR agreements | agreement     4
Transferred over Time | Phase 3 Clinical Trial      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gross contract asset     $ 10,000,000
Maximum | Transferred over Time | Development, Regulatory, & Commercial Milestones and Tiered Royalties      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments     $ 375,000,000
Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value $ 166,864,000 $ 321,586,000  
Liabilities, fair value 3,557,000 3,793,000  
Recurring | Contingent liabilities - CyDex      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 84,000 349,000  
Recurring | Contingent liabilities - Metabasis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 3,429,000 3,358,000  
Recurring | Liability for restricted investments owed to former licensees      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 44,000 86,000  
Recurring | Short-term investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 103,742,000 290,697,000  
Recurring | Investment in Viking common stock (2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 63,122,000 30,889,000  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 67,114,000 40,624,000  
Liabilities, fair value 44,000 86,000  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent liabilities - CyDex      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 0 0  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent liabilities - Metabasis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 0 0  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Liability for restricted investments owed to former licensees      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 44,000 86,000  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 3,992,000 9,735,000  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Investment in Viking common stock (2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 63,122,000 30,889,000  
Recurring | Significant Other Observable Inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 99,615,000 280,553,000  
Liabilities, fair value 3,429,000 3,358,000  
Recurring | Significant Other Observable Inputs (Level 2) | Contingent liabilities - CyDex      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 0 0  
Recurring | Significant Other Observable Inputs (Level 2) | Contingent liabilities - Metabasis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 3,429,000 3,358,000  
Recurring | Significant Other Observable Inputs (Level 2) | Liability for restricted investments owed to former licensees      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 0 0  
Recurring | Significant Other Observable Inputs (Level 2) | Short-term investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 99,615,000 280,553,000  
Recurring | Significant Other Observable Inputs (Level 2) | Investment in Viking common stock (2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 0 0  
Recurring | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 135,000 409,000  
Liabilities, fair value 84,000    
Recurring | Significant Unobservable Inputs (Level 3) | Contingent liabilities - CyDex      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 84,000 349,000  
Recurring | Significant Unobservable Inputs (Level 3) | Contingent liabilities - Metabasis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 0 0  
Recurring | Significant Unobservable Inputs (Level 3) | Liability for restricted investments owed to former licensees      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Liabilities, fair value 0 0  
Recurring | Significant Unobservable Inputs (Level 3) | Short-term investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value 135,000 409,000  
Recurring | Significant Unobservable Inputs (Level 3) | Investment in Viking common stock (2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, fair value $ 0 $ 0