INCOME TAXES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
INCOME TAXES
Deferred tax assets, net of valuation allowance	$ 8,000
Net operating loss (NOL) carryforwards	5,900
Tax credit carryforwards	$ 1,700
Expiration period from date of origination for net operating loss carryforwards	20 years
Annual limitation for usage of NOL	$ 1,404
Annual limitation for usage of tax credits	295
Deferred tax expense	$ 511	$ 1,756