Accrued product warranty liability (Tables)

3 Months Ended

Mar. 31, 2020

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, 2020 and 2019:

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Balance, beginning of period	$	215		$	273
Warranties issued		45			40
Warranty settlements		(47	)		(60	)
Balance, end of period	$	213		$	253