Product Warranty (Tables)

9 Months Ended

Sep. 30, 2020

Product Warranty

Schedule of product warranty liability

	Nine months ended
	September 30,
	2020		2019
	(in thousands)
Balance at January 1 (beginning of year)	$	3,244	$	5,091
Warranties issued during the period		3,780		2,282
Settlements made during the period		(3,131)		(4,405)
Changes in estimate of liability for pre-existing warranties during the period		584		523
Balance at September 30 (end of period)	$	4,477	$	3,491
Amount classified as current	$	4,151	$	3,251
Amount classified as long-term		326		240
Total warranty liability	$	4,477	$	3,491