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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of inventories [Abstract]
Raw materials and work in progress	$ 11,059	$ 7,105
Finished goods	12,903	12,103
Total inventories	$ 23,962	$ 19,208

The aggregate carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of items which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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