Organization and Summary of Significant Accounting Policies (Details 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Sales by geographic area
Percentage of Sales by Geographic Area	100.00%	100.00%	100.00%
United States [Member]
Sales by geographic area
Percentage of Sales by Geographic Area	81.00%	80.00%	79.00%
Other Countries [Member]
Sales by geographic area
Percentage of Sales by Geographic Area	19.00%	20.00%	21.00%