Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Accrued Liabilities [Abstract]

Schedule Of Accrued Liabilities

	As of December 31,
	2011		2010
Accrued compensation and benefits	$	10,665	$	8,303
Accrued warranties		2,365		1,857
Professional and legal fees		966		1,000
Other accrued liabilities		4,080		4,048
	$	18,076	$	15,208

Schedule Of Product Warranty Liability

	Years ended December 31,
	2011			2010			2009
Beginning Balance	$	1,857		$	1,253		$	2,381
Provision for warranty expense		2,953			2,589			1,731
Warranty expired		(2,445	)		(1,985	)		(2,859	)
Ending Balance	$	2,365		$	1,857		$	1,253