Product Warranty (Tables)

12 Months Ended

Dec. 31, 2021

Product Warranty

Schedule of product warranty liability

	Year ended December 31,
	2021		2020		2019
	(in thousands)
Balance at January 1 (beginning of year)	$	4,612	$	3,244	$	5,091
Warranties issued during the period		7,808		5,005		3,615
Settlements made during the period		(4,282)		(4,270)		(5,548)
Changes in estimate of liability for pre-existing warranties during the period		(1,214)		633		86
Balance at December 31 (end of period)	$	6,924	$	4,612	$	3,244
Amount classified as current	$	6,424	$	4,280	$	2,759
Amount classified as long-term		500		332		485
Total warranty liability	$	6,924	$	4,612	$	3,244