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BALANCE SHEET COMPONENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment, Gross	$ 1,860	$ 1,202
Less accumulated depreciation	(1,082)	(1,014)
Property and Equipment, Net	778	188
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Original book value	461	461
Accumulated depreciation	(411)	(379)
Net book value	50	82
Office furniture and equipment
Property, Plant and Equipment, Gross	1,065	998
Assembly equipment
Property, Plant and Equipment, Gross	128	128
Vehicles
Property, Plant and Equipment, Gross	129	76
LeaseholdImprovements
Property, Plant and Equipment, Gross	479	0
Leased devices
Property, Plant and Equipment, Gross	$ 59	$ 0

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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