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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2019
Guarantees and Product Warranties [Abstract]  
Product Warranty Activity
Product warranty activity was as follows (in thousands):
 
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
  
2019
    
2018
    
2019
    
2018
  
Balance at the beginning of the period
  $
 
270
     $
 
326
     $
 
268
     $
 
290
  
Accruals for warranties for products sold in the period
   
29
      
6
      
113
      
139
  
Fulfillment of warranty obligations
   
(41
 )    
(17
 )    
(123
 )    
(94
 )
Revisions of estimated obligations
   
—
        
(58
 )    
—
        
(78
 )
                                 
Balance at the end of the period
  $
258
     $
257
     $
258
     $
257