Certain Financial Statement Information (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Schedule of Accounts receivable
Accounts receivable	$ 15,211	$ 23,765
Less: allowance for bad debts	(936)	(1,099)
Accounts receivable, net	$ 14,275	$ 22,666	[1]

[1] Note: Amounts have been derived from the March 31, 2012 audited consolidated financial statements.