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BALANCE SHEET COMPONENTS
 12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
BALANCE SHEET COMPONENTS
(3)   BALANCE SHEET COMPONENTS
 
The components of certain balance sheet line items are as follows (in thousands):
 
 
 
December 31,
 
 
 
2017
 
2016
 
Property and equipment:
 
 
 
 
 
 
 
Office furniture and equipment
 
$
998
 
$
911
 
Rental inventory
 
 
-
 
 
1,411
 
Assembly equipment
 
 
128
 
 
125
 
Vehicles
 
 
76
 
 
76
 
 
 
 
1,202
 
 
2,523
 
Less accumulated depreciation
 
 
(1,014)
 
 
(1,943)
 
 
 
$
188
 
$
580
 
 
 
 
December 31,
 
 
 
2017
 
2016
 
Assets acquired under capital lease:
 
 
 
 
 
 
 
Original book value
 
$
461
 
$
461
 
Accumulated depreciation
 
 
(379)
 
 
(287)
 
Net book value
 
$
82
 
$
174
 
 
Depreciation expense recorded was $0.3 million and $0.4 million for the years ended December 31, 2017 and 2016, respectively.
 
Included in computer and office &; manufacturing equipment at December 31, 2017 and 2016 are assets under capital lease. Depreciation expense related to assets under capital leases was $0.1 million for the years ended December 31, 2017 and 2016, respectively.
 
During the year ending December 31, 2017 Rental inventory was written off and going forward, units will be fully expensed when they leave the facility on the initial purchase. Depreciation expense related to rental inventory was $0.1 million and $0.3 million for the years ended December 31, 2017 and 2016, respectively.