Collaboration, License, Co-Promotion and Other Commercial Agreements - European Territory (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Oct. 31, 2015
Almirall
Collaboration, License and Co-Promotion Agreements
Annual royalty			5 years
Almirall S A and Allergan Plc | Europe | Product related collaborative arrangements
Collaboration, License and Co-Promotion Agreements
Remaining milestone payment due upon the amendment to the license agreement					$ 42.5
Revenue recognized in royalty payments	$ 0.2	$ 0.2	$ 0.2	$ 0.2