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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of inventories [Abstract]    
Raw materials and work-in-process $ 9,250 $ 9,012
Finished goods 13,491 13,455
Total inventories $ 22,741 $ 22,467 [1]
[1] Restated