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Accrued product warranty liability (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2019 and 2018:

 
 
Six Months Ended
June 30,
 
 
 
2019
  
2018
 
 
 
(In thousands)
 
 
      
Balance, beginning of period
 
$
273
  
$
267
 
Warranties issued
  
81
   
177
 
Warranty settlements
  
(130
)
  
(141
)
Balance, end of period
 
$
224
  
$
303