Certain Financial Statement Information (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Schedule of Inventories
Finished goods	$ 14,436	$ 17,883
Work in process	3,338	3,818
Raw materials	663	1,543
Inventories, total	$ 18,437	$ 23,244	[1]

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