INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss carryforward	$ 9,764	$ 8,162
Inventory differences	1,222	1,044
Equity compensation	688	704
Investment in subsidiaries	581	903
Restructuring	2,328	2,166
Other, net	791	499
Gross deferred tax assets	15,374	13,478
Less valuation allowances	(11,679)	(9,357)
Total deferred tax assets	3,695	4,121
Deferred tax liabilities:
Purchased intangible assets and goodwill	(4,013)	(4,821)
Depreciation and amortization	(1,130)	(1,322)
Other, net	0	(97)
Total deferred tax liabilities	(5,143)	(6,240)
Net deferred tax liabilities	$ (1,448)	$ (2,119)