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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Current:          
Inventory, Current, Raw Materials, Net of Reserves $ 2,340   $ 2,340   $ 1,362
Inventory, Current, Finished Goods, Net of Reserves 10,940   10,940   10,916
Inventories, current 13,280   13,280   12,278
Long-term:          
Raw materials 329   329   227
Finished Goods 663   663   324
Inventory, Noncurrent 992   992   551
Inventory, finished goods, amount under consignment 1,607   1,607   1,520
Losses incurred on valuation of inventory and write-off of obsolete inventory $ 113 $ 256 $ 537 $ 524