Product Warranty

12 Months Ended

Dec. 31, 2015

Product Warranties Disclosures [Abstract]

Product Warranty

Product Warranty

As of December 31, 2015 and 2014, MRV's product warranty liability recorded in accrued liabilities was $0.6 million. The following table summarizes the activity related to the product warranty liability (in thousands):

	Balance at beginning of period		Cost of warranty claims			Accruals for product warranties			Foreign currency translation adjustment		Balance at end of period
December 31, 2013	$	1,006	$	(321	)	$	(107	)	$	—	$	578
December 31, 2014	$	578	$	(17	)	$	55		$	—	$	616
December 31, 2015	$	616	$	—		$	(23	)	$	—	$	593

MRV accrues for warranty costs as part of its cost of sales based on associated material product costs, technical support labor costs and associated overhead. The products sold are generally covered by a warranty for periods of 90 days to three years.