ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ACCRUED LIABILITIES
Accrued compensation	$ 7,650	$ 11,730
Accrued royalties	9,111	21,703
Other accrued liabilities	30,838	25,965
Total accrued liabilities	$ 47,599	$ 59,398