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Product Warranties (Tables)
 12 Months Ended
Dec. 31, 2018
Guarantees and Product Warranties [Abstract]  
Product Warranty Activity
Product warranty activity for the years ended December 31 was as follows (in thousands):
 
 
 
2018
 
 
2017
 
 
2016
 
Balance at the beginning of the period
 
$
290
 
 
$
214
 
 
$
585
 
Accruals for warranties for products sold in the period
 
 
173
 
 
 
346
 
 
 
358
 
Fulfillment of warranty obligations
 
 
(117
)
 
 
(194
)
 
 
(527
)
Revisions of estimated obligations
 
 
(78
)
 
 
(76
)
 
 
(202
)
Balance at the end of the period
 
$
268
 
 
$
290
 
 
$
214