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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Government rebates payable $ 3,497 $ 3,158
Compensation related costs 3,386 7,143
Accrued royalties and contingent consideration 4,459 4,688
Research and development 5,476 4,281
Selling, general and administrative 1,282 2,703
Legal fees 498 882
Interest 776 259
Miscellaneous accrued 1,018 706
Accrued expenses $ 20,392 $ 23,820