Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

v3.8.0.1
Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Reserve for Doubtful Accounts Receivable [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 168 $ 91 $ 62
Charged to Costs and Expenses 177 91 38
Deductions (6) (14) (9)
Balance at End of Period 339 168 91
Product Warranty Liability [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 538 686 653
Charged to Costs and Expenses 527 106 336
Deductions (572) (254) (303)
Balance at End of Period 493 538 686
Restructuring Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 120 74 1,718
Charged to Costs and Expenses 316 630 (3)
Deductions (418) (584) (1,641)
Balance at End of Period $ 18 $ 120 $ 74