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BALANCE SHEET COMPONENTS (Tables)
 3 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of components of certain balance sheet line items
The components of certain balance sheet line items are as follows (in thousands):
 
 
 
March 31, 2019
 
 
December 31, 2018
 
Property and equipment
 
 
 
 
 
 
 
 
Office furniture and equipment
 
$
1,541
 
 
$
1,172
 
Assembly equipment
 
 
128
 
 
 
128
 
Vehicles
 
 
184
 
 
 
184
 
Leasehold improvements
 
 
482
 
 
 
480
 
Leased devices
 
 
411
 
 
 
317
 
 
 
$
2,746
 
 
 
2,281
 
Less accumulated depreciation
 
 
(1,955
)
 
 
(1,462
)
 
 
$
791
 
 
$
819