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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Compensation $ 9,885 $ 8,738
Royalties 5,362 4,454
Research and development agreements 1,389 570
Professional fees 296 507
Consulting 407 370
Other 48 347
Accrued expenses $ 17,387 $ 14,986