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Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Schedule of Accrued Liabilities [Line Items]    
Employee compensation $ 5,861 $ 9,272
Research and development 1,238 519
Sales taxes 1,108 948
Warranty 800 726
Professional, accounting and auditing fees 383 427
Other 744 588
Accrued expenses $ 10,134 $ 12,480