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Fair Value Measurements - Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Feb. 02, 2021
Jan. 28, 2021
Mar. 09, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Fair value assets, transfers between Level 1, Level 2 or Level 3 $ 0   $ 0      
Fair value liabilities, transfers between Level 1, Level 2 or Level 3 0   0      
Equity security investment 49,803,000   43,653,000 [1]      
Gains and losses from investment in equity securities 964,000 $ (12,866,000)        
Estimated fair value of outstanding term loan 377,400,000   377,200,000      
LianBio            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Equity security investment 9,800,000   8,200,000      
Level 1            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Equity security investment 40,000,000.0   35,500,000      
2029 Notes            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Debt Instrument face amount 747,500,000     $ 747,500,000 $ 717,500,000  
Estimated fair value of notes payable 480,400,000   314,000,000.0      
2027 Notes            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Debt Instrument face amount 550,000,000.0         $ 550,000,000.0
Estimated fair value of notes payable $ 416,600,000   $ 218,600,000      
[1] The condensed consolidated balance sheet as of December 31, 2022 is derived from the audited consolidated financial statements as of that date.