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Schedule of Revenue from Collaborations and Services (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues $ 17,448 $ 3,465
Research Agreement | United Therapeutics Corporation    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues 4,700  
Collaboration and License Agreement | United Therapeutics Corporation    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues 7,600  
Collaborations and services    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues 12,372 63
Collaborations and services | License Agreement | United Therapeutics Corporation    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues 7,615  
Collaborations and services | Research Agreement | United Therapeutics Corporation    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues 4,658  
Collaborations and services | Collaboration and License Agreement | Receptor    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues 62 $ 63
Collaborations and services | License and Distribution Agreement | Cipla Ltd    
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]    
Total revenues $ 37