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Accrued product warranty liability (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016:

 
Six Months Ended June 30,
 
 
2017
 
2016
 
 
(In thousands)
 
 
    
Balance, beginning of period
 
$
267
  
$
277
 
Warranties issued
  
105
   
131
 
Warranty settlements
  
(123
)
  
(136
)
Balance, end of period
 
$
249
  
$
272