Inventories (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Inventory Disclosure [Abstract]
Losses incurred on valuation of inventory and write-off of obsolete inventory	$ 0	$ 90
Current:
Raw materials	936		734
Finished goods	10,668		10,139
Inventories, current	11,604		10,873
Long-term:
Raw materials	857		891
Finished Goods	956		1,064
Inventory, Noncurrent	1,813		1,955
Inventory, finished goods, amount under consignment	$ 1,568		$ 1,289