ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Government rebates payable	$ 4,470	$ 3,158
Compensation related costs	6,387	7,143
Legal fees	4,050	882
Accrued royalties and contingent consideration	13,194	4,688
Research and development	6,694	4,281
Selling, general and administrative	1,417	2,704
Miscellaneous accrued	4,164	964
Accrued expenses	$ 40,376	$ 23,820