Inventories (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Inventory Disclosure [Abstract]
Losses incurred on valuation of inventory and write-off of obsolete inventory	$ 0	$ 188	$ 0	$ 278
Current:
Raw materials	902		902		734
Finished goods	11,402		11,402		10,139
Inventories, current	12,304		12,304		10,873
Long-term:
Raw materials	681		681		891
Finished Goods	928		928		1,064
Inventory, Noncurrent	1,609		1,609		1,955
Inventory, finished goods, amount under consignment	$ 1,605		$ 1,605		$ 1,289