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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Inventory Disclosure [Abstract]          
Losses incurred on valuation of inventory and write-off of obsolete inventory $ 256 $ 0 $ 524 $ 278  
Current:          
Raw materials 1,125   1,125   734
Finished goods 11,317   11,317   10,139
Inventories, current 12,442   12,442   10,873
Long-term:          
Raw materials 527   527   891
Finished Goods 593   593   1,064
Inventory, Noncurrent 1,120   1,120   1,955
Inventory, finished goods, amount under consignment $ 1,486   $ 1,486   $ 1,289