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Commitments and contingencies (Tables)
 6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
The warranty reserve for the six months ended June 30, 2018 and 2017 was as follows:


 
Six Months Ended June 30,
(In thousands)
 
(Unaudited)

 
2018
 
2017
Balance at the beginning of the period
 
$
2,846

 
$
2,686

Accruals for warranties issued during the period
 
1,456

 
1,288

Accruals related to pre-existing warranties
 
155

 
161

Settlements made (in cash or in kind) during the period
 
(1,459
)
 
(1,330
)
Balance at the end of the period
 
$
2,998

 
$
2,805