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Accrued product warranty liability (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 and 2017:

 
 
Nine Months Ended
September 30,
 
 
 
2018
  
2017
 
 
 
(In thousands)
 
 
      
Balance, beginning of period
 
$
267
  
$
267
 
Warranties issued
  
233
   
184
 
Warranty settlements
  
(205
)
  
(187
)
Balance, end of period
 
$
295
  
$
264