Summary of Significant Accounting Policies (Details 4)	12 Months Ended
	Dec. 31, 2015
Revenue Recognition [Abstract]
Shelf life of Remodulin, Tyvaso and Orenitram sold to customers, minimum	1 year
Inventory holding period of Remodulin,Tyvaso and Orenitram, low end of range	30 days
Inventory holding period of Remodulin, Tyvaso and Orenitram, high end of range	60 days
Maximum exchanges of Remodulin, Tyvaso, Orenitram and Unituxin as compared to the total volume of units sold (as a percent)	1.00%
Income taxes
Minimum percentage of likelihood of realization of recognized tax benefit	50.00%