Concentrations of Credit Risk (Details) (Distributor [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Distributor [Member]
Percentage Of Revenue Contributed To Total Revenue By Major Customer	80.70%	86.70%	83.20%	76.40%