Product Warranties (Tables)

6 Months Ended

Jun. 30, 2012

Product Warranties [Abstract]

Product warranty activity

Product warranty activity for the three and six months ended June 30, was as follows (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Balance at the beginning of the period	$	554		$	1,260		$	572		$	649
Accruals for warranties for products sold in the period		136			309			218			1,034
Fulfillment of warranty obligations		(197	)		(281	)		(297	)		(409	)
Revisions of estimated obligations		(32	)		11			(32	)		25
Balance at the end of the period	$	461		$	1,299		$	461		$	1,299