Annual report pursuant to Section 13 and 15(d)

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail)

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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Reserve for doubtful accounts receivable [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 33 $ 43 $ 26
Charged to Costs and Expenses 19 (10) 98
Charged to Other Accounts       
Deductions (6)   (81)
Balance at End of Period 46 33 43
Product warranty liability [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 408 215 202
Charged to Costs and Expenses 125 360 53
Charged to Other Accounts        
Deductions (225) (167) (40)
Balance at End of Period $ 308 $ 408 $ 215