INCOME TAXES - Rec and Deferred (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of the income tax provision (benefit)
Federal income tax provision (benefit) at statutory rate	$ 726	$ 982
State tax expense net of federal tax benefit	63	112
Foreign taxes	(116)	(103)
Other	27	(8)
Change in statutory tax rate	169
Change in valuation allowance	5	(989)
Total income tax provision (benefit)	$ 874	$ (6)
Reconciliation of the income tax provision (benefit) (as a percent)
Federal income tax provision (benefit) at statutory rate (as a percent)	34.00%	34.00%
State tax expense net of federal tax benefit (as a percent)	3.00%	3.90%
Foreign taxes (as a percent)	(5.40%)	(3.60%)
Other (as a percent)	1.30%	(0.30%)
Change in statutory tax rate (as a percent)	7.90%	0.00%
Change in valuation allowance (as a percent)	0.20%	(34.20%)
Income tax provision (benefit) (as a percent)	41.00%	(0.20%)
Deferred tax assets, net
Net operating loss carryforward	$ 287	$ 420
Credits	5	6
Accruals	13	17
Reserves	22	8
Fixed assets and intangible property	69	93
Stock compensation	82	74
Other, deferred asset	20	57
Total deferred tax assets	498	675
Valuation allowance	(5)		$ (989)
Net deferred tax assets	$ 493	$ 675