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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of Warranty Reserve
Product warranty reserve activity for the years ended December 31 is as follows (in thousands):

 
2018
2017
2016
Beginning balance
$
192

$
1

$
—

Provisions
420

331

18

Warranty expenses incurred
(397
)
(140
)
(17
)
 
$
215

$
192

$
1