Arena License Agreement (Details) - Arena Pharmaceuticals, Inc. - USD ($) $ in Millions		1 Months Ended
	Jan. 24, 2019	Jan. 31, 2019
Collaborative Arrangements and Non-collaborative Arrangement Transactions
Upfront payment	$ 800.0	$ 800.0
Marketing approval in the United States
Collaborative Arrangements and Non-collaborative Arrangement Transactions
Milestone payment to be made upon marketing approval	250.0
Marketing approval in any of Japan, France, Italy, the United Kingdom, Spain or Germany
Collaborative Arrangements and Non-collaborative Arrangement Transactions
Milestone payment to be made upon marketing approval	$ 150.0