Product Warranty

3 Months Ended

Mar. 31, 2017

Product Warranties Disclosures [Abstract]

Product Warranty

Product Warranty

As of March 31, 2017 and December 31, 2016, MRV's product warranty liabilities recorded in accrued liabilities was $0.6 million. MRV accrues for warranty costs as part of 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.

The following table summarizes the activity related to the product warranty liability during the three months endedMarch 31, 2017 (in thousands):

Balance at beginning of the period	$	587
Reversed to expense	(14		)
Cost of warranty claims	2
Balance at end of the period	$	575