INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 12,793	$ 11,436
Unrecognized tax benefits	79	$ 79	$ 515
Unrecognized tax benefits, accrued interest and penalties	100
Unrecognized tax benefits, income tax penalties and expense	11
Current Liabilities
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits	200
Other Long-term Liabilities
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits	100
Foreign Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward	3,600
Charitable Contribution Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 200