Inventories and Deferred Costs of Goods Sold (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Raw materials	$ 1,784	$ 2,284
Work in process	2,103	3,871
Finished goods	1,429	998
Net inventory	5,316	7,153
Deferred cost of goods sold	185	180
Inventory Valuation Reserves	860	860
Inventory write-off	$ 317	$ 184