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ACCRUED EXPENSES - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Compensation $ 10,833 $ 9,885
Royalties 5,823 5,362
Research and development agreements 757 1,389
Consulting 524 407
Professional fees 238 296
Other 1,670 48
Accrued expenses $ 19,845 $ 17,387