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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Inventories      
Raw materials $ 3,832 $ 1,299  
Work in progress 448 971  
Finished goods 10,049 8,260  
Inventories 14,329 10,530  
Fixed production overhead charged to cost of sales 2,217 3,140 1,205
Inventory provision for products likely to be expired included in cost of sales $ 1,399 $ 3,479 $ 4,034