COLLABORATION AGREEMENTS (Details) - License agreements - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Collaborative Agreements
Nonrefundable license fee expense	$ 1.6	$ 0.9	$ 3.2
Medarex | Maximum
Collaborative Agreements
Period from the first commercial sale of licensed product for royalty payment	10 years
Milestone payment due	$ 7.0
Rockefeller | Maximum
Collaborative Agreements
Milestone payment due	3.8
Southampton | Maximum
Collaborative Agreements
Milestone payment due	1.0
Amgen | Maximum
Collaborative Agreements
Milestone payment due	0.9
Seattle Genetics | CuraGen | Maximum | Glembatumumab Vedotin
Collaborative Agreements
Milestone payment due	5.0
Seattle Genetics | CuraGen | Maximum | CDX-014
Collaborative Agreements
Milestone payment due	$ 8.5