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Collaboration, Licensing and Other Arrangements - Summary of UT Revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Total revenue from UT $ 48,611 $ 18,894 $ 89,237 $ 30,886
United Therapeutics Corporation        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Total revenue from UT 30,230 5,697 53,257 7,739
United Therapeutics Corporation | Commercial Supply Agreement        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Total revenue from UT 10,933 4,695 22,097 5,879
United Therapeutics Corporation | License Agreement        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Total revenue from UT 242 698 427 1,556
United Therapeutics Corporation | Royalties Arrangement        
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Total revenue from UT $ 19,055 $ 304 $ 30,733 $ 304