INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Net operating loss carryforward	$ 8,843	$ 10,144
Inventory differences	695	570
Equity compensation	952	591
Investment in subsidiaries	2,861	3,514
Restructuring	12	1,389
Purchased goodwill	2,516	3,331
Accrued employee compensation and benefits	1,459	979
Other, net	57	144
Gross deferred tax assets	17,395	20,662
Less valuation allowances	(9,143)	(18,063)
Total deferred tax assets	8,252	2,599
Deferred tax liabilities:
Purchased intangible assets and goodwill	(1,566)	(2,644)
Depreciation and amortization	(2,783)	(267)
Other, net	(281)	(163)
Total deferred tax liabilities	(4,630)	(3,074)
Net deferred tax assets (liabilities)	$ 3,622
Net deferred tax assets (liabilities)		$ 475