Concentration Of Credit Risk And Significant Customers (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011
Concentration Of Credit Risk And Significant Customers [Abstract]
Number of customers contributing to more than 10% of accounts receivable			2		1
Percentage of accounts receivable contributed by customers			10.00%		10.00%
Number of direct customer or indirect channel partner contributing more than 10% of total revenue	0	0	0	0
Percentage of revenue contributed by direct customer or indirect channel partner to total revenue	10.00%	10.00%	10.00%	10.00%