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BALANCE SHEET COMPONENTS
 9 Months Ended
Sep. 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):
 
 
 
September 30, 2018
 
 
December 31, 2017
 
Property and equipment:
 
 
 
 
 
 
 
 
Office furniture and equipment
 
$
1,149
 
 
$
998
 
Assembly equipment
 
 
128
 
 
 
128
 
Vehicles
 
 
181
 
 
 
76
 
  Leasehold improvements
 
 
480
 
 
 
-
 
  Leased devices
 
 
152
 
 
 
-
 
 
 
$
2,090
 
 
$
1,202
 
Less accumulated depreciation
 
 
(1,261
)
 
 
(1,014
)
 
 
$
829
 
 
$
188
 
 
 
 
September 30,2018
 
 
December 31,2017
 
Assets acquired under capital lease:
 
 
 
 
 
 
 
 
Original book value
 
$
461
 
 
$
461
 
Accumulated depreciation
 
 
(427
)
 
 
(379
)
Net book value
 
$
34
 
 
$
82
 
 
The Company monitors devices out on lease for potential loss and places an estimated reserve on the net book value based on historical loss rates.
 
Total depreciation expense related to our property and equipment was $0.1 million for the three months ended September 30, 2018 and 2017. Total depreciation expense was $0.1 million and $0.2 million for the nine months ending September 30, 2018 and 2017, respectively
 
Total depreciation expense related to devices out on lease was $0.1 million for the three and nine months ended September 30, 2018. Total depreciation expense was $0.2 million and $0.3 million for the three and nine months ending September 30, 2017, respectively. Depreciation on leased units is reflected on the income statement as cost of revenue.
 
Included in office furniture and equipment at September 30, 2018 and December 31, 2017 are assets under capital lease. Depreciation expense related to assets under capital leases was $16,000 and $48,000 for the three and nine months ended September 30, 2018.