ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ACCRUED LIABILITIES
Accrued compensation	$ 7,992	$ 11,730
Accrued royalties	9,610	21,703
Other accrued liabilities	31,426	25,965
Total accrued liabilities	$ 49,028	$ 59,398