SUBSEQUENT EVENTS (Details) - Subsequent events - Sarissa Group $ in Millions	Feb. 12, 2018 USD ($) director
Subsequent Events
Appointment of designees as as members of the Company's Board of Directors	3
Total number of directors nominated for election	5
Number of new directors nominated for election	3
Number of current directors nominated for election	2
Payments for agreements with related parties | $	$ 2.7
Number of related party principals are the members of the Company's Board of Directors	2