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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 3,594 $ 3,373
Accumulated depreciation 3,157 2,872
Property and equipment, net 437 501
Computer equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 725 723
Office furniture and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 298 293
Machinery and laboratory equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 612 604
Field service units [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,626 1,420
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 333 $ 333