Product Warranty (Tables)

6 Months Ended

Jun. 30, 2016

Product Warranties Disclosures [Abstract]

Summary of product warranty activity

The following table summarizes product warranty activity during 2016 and 2015:

	Six Months Ended
	June 30,
	2016			2015
Beginning balance	$	1,880		$	1,853
Charges to expense	1,044			538
Costs incurred	(697		)	(632		)
Ending balance	$	2,227		$	1,759