Note 5. Warranty

The Company provides a standard one-year warranty on all systems. Warranty coverage provided is for labor and parts necessary to repair the systems during the warranty period. The Company accounts for the estimated warranty cost of the standard warranty coverage as a charge to costs of revenue when revenue is recognized. The estimated warranty cost is based on historical product performance. To determine the estimated warranty reserve, the Company utilizes historical service costs to calculate the expected service expense per system and applies this to the equivalent number of units exposed under warranty. The Company updates these estimated charges every quarter.

The following table provides the changes in the product warranty accrual for the three months ended March 31, 2014 and 2013 (in thousands):

	March 31,
	2014			2013
Beginning Balance	$	1,202		$	1,212
Add: Accruals for warranties issued during the period		456			901
Less: Settlements made during the period		(587	)		(1,054	)
Ending Balance	$	1,071		$	1,059