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BALANCE SHEET COMPONENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment, Gross $ 1,615 $ 1,202
Less accumulated depreciation (1,040) (1,014)
Property and Equipment, Net 575 188
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]    
Original book value 461 461
Accumulated depreciation (395) (379)
Net book value 66 82
Office furniture and equipment    
Property, Plant and Equipment, Gross 1,033 998
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]    
Original book value 461 461
Assembly equipment    
Property, Plant and Equipment, Gross 128 128
Vehicles    
Property, Plant and Equipment, Gross 76 76
Leasehold improvements    
Property, Plant and Equipment, Gross $ 378 $ 0