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BALANCE SHEET COMPONENTS
 3 Months Ended
Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
BALANCE SHEET COMPONENTS
(2) BALANCE SHEET COMPONENTS
 
The components of certain balance sheet line items are as follows (in thousands):
 
Property and equipment:
 
March 31,2018
 
December 31,2017
 
Office furniture and equipment
 
$
1,033
 
$
998
 
Assembly equipment
 
 
128
 
 
128
 
Vehicles
 
 
76
 
 
76
 
Leasehold improvements
 
 
378
 
 
-
 
 
 
$
1,615
 
$
1,202
 
Less accumulated depreciation
 
 
(1,040)
 
 
(1,014)
 
 
 
$
575
 
$
188
 
 
Assets acquired under capital lease:
 
March 31,2018
 
December 31,2017
 
Original book value
 
$
461
 
$
461
 
Accumulated depreciation
 
 
(395)
 
 
(379)
 
Net book value
 
$
66
 
$
82
 
 
Included in total assets at March 31, 2018 are $0.2 million in assets for leasehold improvements that have been completed and are accounted for in accrued liabilities but not yet settled.
 
Total depreciation expense related to our property and equipment was $26,000 and $0.1 million for the three months ended March 31 2018 and 2017, respectively.
 
Included in computer and office & manufacturing equipment at March 31, 2018 and December 31, 2017 are assets under capital lease. Depreciation expense related to assets under capital leases was $16,000 and $23,000 for the months ended March 31, 2018 and 2017, respectively.