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BALANCE SHEET COMPONENTS
 6 Months Ended
Jun. 30, 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:
 
June 30, 2018
 
 
December 31, 2017
 
Office furniture and equipment
 
$
1,065
 
 
$
998
 
Assembly equipment
 
 
128
 
 
 
128
 
Vehicles
 
 
129
 
 
 
76
 
Leasehold improvements
 
 
479
 
 
 
-
 
Leased devices
 
 
59
 
 
 
-
 
 
 
$
1,860
 
 
$
1,202
 
Less accumulated depreciation
 
 
(1,082
)
 
 
(1,014
)
 
 
$
778
 
 
$
188
 
 
Assets acquired under capital lease:
 
June 30, 2018
 
 
December 31, 2017
 
Original book value
 
$
461
 
 
$
461
 
Accumulated depreciation
 
 
(411
)
 
 
(379
)
Net book value
 
$
50
 
 
$
82
 
 
The Company monitors units on lease for potential loss and places an estimated reserve on the net book value of units leased based on historical loss rates.
 
Total depreciation expense related to our property and equipment was $42,000 and $68,000 for the three months ended June 30, 2018 and 2017, respectively. Total depreciation expense was $0.1 million for the six months ending June 30, 2018 and 2017.
 
Included in o office furniture and equipment
at June 30, 2018 and December 31, 2017 are assets under capital lease. Depreciation expense related to assets under capital leases was $16,000 and $32,000 for the three and six months ended June 30, 2018.