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
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Reserve for Doubtful Accounts Receivable [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 62 $ 46 $ 33
Charged to Costs and Expenses 38 24 19
Deductions (9) (8) (6)
Balance at End of Period 91 62 46
Product Warranty Liability [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 653 308 408
Charged to Costs and Expenses 336 930 125
Deductions (303) (585) (225)
Balance at End of Period 686 653 $ 308
Restructuring Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 1,718    
Charged to Costs and Expenses (3) 1,718  
Deductions (1,641)    
Balance at End of Period $ 74 $ 1,718