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Accrued product warranty liability (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017:

 
Six Months Ended
June 30,
 
 
2018
 
2017
 
 
(In thousands)
 
 
    
Balance, beginning of period
 
$
267
  
$
267
 
Warranties issued
  
177
   
105
 
Warranty settlements
  
(141)
 
  
(123)
 
Balance, end of period
 
$
303
  
$
249