INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Cash paid for income taxes			$ 36	$ 213	$ 357
One-time transition tax	$ 10	$ 38
GILTI adjustment			230
Unremitted earnings for controlled foreign corporations		$ 200		$ 200
Tax Years 2018 Through 2022
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	68,300		68,300
Tax Years 2024 Through 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,500		5,500
Tax Year 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	500		500
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	74,300		74,300
Domestic Tax Authority | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 500		$ 500