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Product Warranties (Tables)
3 Months Ended
Mar. 31, 2019
Guarantees and Product Warranties [Abstract]  
Product Warranty Activity
 
 
 
Three Months Ended
March 31,
 
 
 
2019
 
 
2018
 
Balance at the beginning of the period
 
$
268
 
 
$
290
 
Accruals for warranties for products sold in the period
 
 
29
 
 
 
123
 
Fulfillment of warranty obligations
 
 
(66
)
 
 
(57
)
Revisions of estimated obligations
 
 
 
 
 
(10
)
Balance at the end of the period
 
$
231
 
 
$
346