ACCRUED EXPENSES (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Government rebates payable	$ 3,826	$ 3,158
Compensation related costs	4,765	7,143
Accrued royalties and contingent consideration	5,069	4,688
Research and development	5,725	4,281
Selling, general and administrative	1,619	2,704
Miscellaneous accrued	2,155	1,846
Accrued expenses	$ 23,159	$ 23,820