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Accrued Liabilities and Deferred Revenue (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Changes in initial product warranty accrual and expenses under initial and extended warranties
Initial warranty accrual, beginning balance	$ 1,926	$ 2,728	$ 2,218	$ 2,725
Provision for estimated warranty cost	661	448	783	956
Warranty expenditures	(607)	(490)	(1,021)	(995)
Initial warranty accrual, ending balance	1,980	2,686	1,980	2,686
Total warranty accrual, long term		431		431
Total warranty accrual, current portion	$ 1,980	$ 2,255	$ 1,980	$ 2,255

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

+ References+ Details