Warrant (Details) - KUPI - Warrant issued to UCB $ / shares in Units, shares in Millions, $ in Millions	Nov. 25, 2015 USD ($) $ / shares shares
Class of Warrant or Right
Number of common stock to be purchased under the warrant | shares	2.5
Warrants expiration period	3 years
Warrants exercise price | $ / shares	$ 48.90
Issuance of a warrant to finance KUPI acquisition | $	$ 29.9