Product Warranty (Tables)

9 Months Ended

Sep. 30, 2019

Product Warranties Disclosures [Abstract]

Summary of product warranty activity

The following table summarizes product warranty activity during 2019 and 2018:

	Nine Months Ended
	September 30,
	2019			2018
Beginning balance	$	1,916		$	2,074
Charges to expense	1,478			1,592
Costs incurred	(1,106		)	(1,634		)
Ending balance	$	2,288		$	2,032