VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 431	$ 489	$ 235
Additions Charged (Credited) to Costs and Expenses	43	126	417
Adjustments/Deductions	136	(184)	(163)
Balance at End of Year	610	431	489
Inventory reserve
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	2,315	2,546	1,823
Additions Charged (Credited) to Costs and Expenses	898	538	905
Adjustments/Deductions	(638)	(769)	(182)
Balance at End of Year	$ 2,575	$ 2,315	$ 2,546