Product Warranty (Tables)

9 Months Ended

Sep. 30, 2014

Product Warranties Disclosures [Abstract]

Summary of product warranty activity

The following table summarizes product warranty activity during 2014 and 2013:

	Nine Months Ended
	September 30,
	2014			2013
Beginning balance	$	1,269		$	814
Charges to expense	1,447			746
Costs incurred	(1,050		)	(550		)
Ending balance	$	1,666		$	1,010