K. OTHER INCOME AND EXPENSE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other income (expense)
Foreign exchange transaction loss	$ (2,012)	$ (617)	$ (1,847)
Government subsidy income	211	164	217
Other non-operating gain	110	32	117
Loss on disposal of assets	(97)	(126)	(78)
Other income and expense, net	$ (1,788)	$ (547)	$ (1,591)