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Accrued product warranty liability (Tables)
3 Months Ended
Mar. 31, 2022
Accrued product warranty liability [Abstract]  
Product Warranty Liability
The following table summarizes the activity recorded in the accrued product warranty liability during the three months ended March 31, 2022 and 2021:

 
Three Months Ended
 
 
March 31,
 
   
2022
   
2021
 
   
(In thousands)
 
             
Balance, beginning of period
 
$
101
   
$
140
 
Warranties issued
   
6
     
5
 
Warranty settlements
   
(17
)
   
(29
)
Balance, end of period
 
$
90
   
$
116