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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current:    
Raw materials $ 1,362 $ 734
Finished goods (including distributor channel inventories) 10,916 10,139
Inventories 12,278 10,873
Long-term:    
Raw materials 227 891
Finished goods 324 1,064
Inventories, long-term 551 1,955
Distributor Channel Inventory [Member]
   
Current:    
Inventories $ 1,520 $ 1,289