Inventories (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Inventory [Line Items]
Distributor channel inventories	$ 1,540		$ 1,698
Losses incurred on valuation of inventory and write-off of obsolete inventory	47	416
Current:
Raw materials	3,071		3,056
Finished goods	12,338		11,408
Inventoryincludingdistributorchannelinventories,net	15,409		14,464
Long-term:
Raw materials	70		59
Finished Goods	620		817
Inventory, Noncurrent	$ 690		$ 876