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Accrued product warranty liability (Tables)
 9 Months Ended
Sep. 30, 2019
Accrued product warranty liability [Abstract]  
Product warranty liability
The following table summarizes the activity recorded in the accrued product warranty liability during the nine months ended September 30, 2019 and 2018:

  
Nine Months Ended
September 30,
 
  
2019
  
2018
 
  
(In thousands)
 
       
Balance, beginning of period
 
$
273
  
$
267
 
Warranties issued
  
138
   
233
 
Warranty settlements
  
(190
)
  
(205
)
Balance, end of period
 
$
221
  
$
295