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BALANCE SHEET COMPONENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Property, Plant and Equipment, Gross | $ 2,281 | $ 1,202
Less accumulated depreciation | (1,462) | (1,014)
Property and Equipment, Net | 819 | 188
Assets acquired under capital lease: |  |
Original book value | 461 | 461
Accumulated depreciation | (441) | (379)
Net book value | 20 | 82
Office furniture and equipment |  |
Property, Plant and Equipment, Gross | 1,172 | 998
Assembly equipment |  |
Property, Plant and Equipment, Gross | 128 | 128
Vehicles |  |
Property, Plant and Equipment, Gross | 184 | 76
Leasehold improvements |  |
Property, Plant and Equipment, Gross | 480 | 0
Leased devices |  |
Property, Plant and Equipment, Gross | $ 317 | $ 0

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