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Inventories (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Inventory [Line Items]
Losses incurred on valuation of inventory and write-off of obsolete inventory	$ 416	$ (34)
Current:
Raw materials	1,959		1,362
Finished goods	10,682		10,916
Inventories, current	12,641		12,278
Long-term:
Raw materials	256		227
Finished Goods	319		324
Inventory, Noncurrent	575		551
Distributor Channel Inventory [Member]
Current:
Inventories, current	$ 1,578		$ 1,520

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