PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 53,462		$ 53,364
Less accumulated depreciation	(36,604)		(36,033)
Total property and equipment, net	16,858		17,331
Depreciation and amortization	1,100	$ 1,000
Operating leases, gross	10,600		10,800
Operating leases, accumulated depreciation	5,400		5,000
Operating leases, net	5,200		5,800
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	377		377
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,076		2,868
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	38,759		38,432
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,662		8,156
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,588		$ 3,531
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