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Inventory (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Inventory [Abstract]        
Raw materials $ 10,750 $ 10,750   $ 9,962
Work-in-process 3,576 3,576   2,390
Finished goods 19,740 19,740   14,438
Deferred program costs 2,389 2,389   2,466
Net inventory 36,455 36,455   29,256
Inventory write-down $ 500 $ 957 $ 2,150