PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 48,833		$ 49,298
Less accumulated depreciation	(33,757)		(33,829)
Total property and equipment, net	15,076		15,469
Depreciation and amortization	900	$ 1,000
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	694		694
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,845		3,845
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,294		28,777
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,348		1,345
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,333		3,408
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,566		10,558
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 753		671
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property plant and equipment, useful life	7 years
Leased equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,800		8,100
Less accumulated depreciation	$ (4,400)		$ (4,600)