Product Warranty

12 Months Ended

Dec. 31, 2011

Product Warranty

Product Warranty

Note 9.  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.

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

	Years Ended December 31,
	2011			2010			2009
	(in thousands)
Balance at January 1 (beginning of year)	$	2,713		$	726		$	3,530
Warranties issued during the period		4,772			3,722			791
Settlements made during the period		(5,275	)		(1,923	)		(2,363	)
Changes in estimate of liability for pre-existing warranties during the period		1,487			188			(1,232	)
Balance at December 31 (end of year)	$	3,697		$	2,713		$	726
Amount classified as current	$	3,556		$	2,556		$	638
Amount classified as long-term		141			157			88
Total Warranty Liability	$	3,697		$	2,713		$	726