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Distribution Agreements (Details) - United States - Remodulin And Tyvaso And Orenitram - item
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Distribution Agreements    
Distribution agreement, initial term 1 year  
Distribution agreement, automatically renew terms 1 year  
Product concentration | Net revenues    
Distribution Agreements    
Number of distributors 2 3