Product Warranty

12 Months Ended

Dec. 31, 2014

Product Warranty

Product Warranty

Note 10.  Product Warranty

        The Company generally offers a one year warranty for all of its systems, the terms and conditions of which vary depending upon the product sold. For all systems sold, the Company accrues a liability for the estimated cost of standard warranty at the time of system shipment and defers the portion of systems revenue attributable to the fair value of non-standard warranty. Costs for non-standard warranty are expensed as incurred. Factors that affect the Company's warranty liability include the number of installed units, historical and anticipated product failure rates, material usage and service labor costs. The Company periodically assesses the adequacy of its recorded liability and adjusts the amount as necessary.

        The changes in the Company's product warranty liability are as follows:

	Years Ended December 31,
	2014			2013			2012
	(in thousands)
Balance at January 1 (beginning of year)	$	1,428		$	1,801		$	3,697
Warranties issued during the period		1,743			2,240			3,042
Settlements made during the period		(2,096	)		(1,515	)		(3,010	)
Changes in estimate of liability for pre-existing warranties during the period		451			(1,098	)		(1,928	)
Balance at December 31 (end of year)	$	1,526		$	1,428		$	1,801
Amount classified as current	$	1,352		$	1,316		$	1,700
Amount classified within other long-term liabilities		174			112			101
Total warranty liability	$	1,526		$	1,428		$	1,801