BUSINESS COMBINATION - Schedule of Fair Value Estimate of Assets Acquired and Liability Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Oct. 05, 2015
Business Acquisition [Line Items]
In-Process Research and Development	$ 171,000	$ 210,600
Goodwill	$ 12,223	$ 12,223
Tripex Pharmaceuticals LLC [Member]
Business Acquisition [Line Items]
Property and equipment			$ 282
Developed Technology			3,200
In-Process Research and Development			210,600
Goodwill			8,948
Fair Value Estimate of Assets Acquired and Liability Assumed			$ 223,030