Distribution Agreements (Details)	12 Months Ended
	Dec. 31, 2012
U.S. Based Specialty Pharmaceutical Distributors
Distribution Agreements
Distribution agreement, initial term	1 year
Distribution agreement, additional terms	1 year
U.S. Based Specialty Pharmaceutical Distributors | Remodulin
Distribution Agreements
Number of distributors	3
U.S. Based Specialty Pharmaceutical Distributors | Tyvaso
Distribution Agreements
Number of distributors	3
International Distributors | Remodulin
Distribution Agreements
Number of distributors	5