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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,500 $ 2,281
Less accumulated depreciation (1,678) (1,462)
Property and Equipment, Net 822 819
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,149 1,172
Assembly equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 128 128
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 181 184
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 500 480
Leased devices    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 542 $ 317