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ACCRUED LIABILITIES - Components of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accrued liabilities [Abstract]    
Personnel-related costs $ 6,014 $ 7,601
Rebates and other sales deductions 2,738 2,833
Clinical trials and research and development costs 3,053 2,076
License royalty payable 2,491 1,951
Royalty-based interest payable 1,511 1,410
Manufacturing costs 2,115 1,577
Deferred rent 1,082 1,086
Travel 998 213
Business development & legal costs 822 1,030
Other 2,815 2,853
Total Accrued Liabilities $ 23,639 $ 22,630