ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ACCRUED LIABILITIES
Compensation and fringe benefits	$ 5,319	$ 7,379
Warranty reserve	879	830
Income taxes payable	1,670	183
Other accrued expenses	3,972	2,286
Accrued liabilities	$ 11,840	$ 10,678