Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

v3.21.1
Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Reserve for Doubtful Accounts Receivable [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 33 $ 33 $ 339
Charged to Costs and Expenses (4)   (167)
Charged to Other Accounts     (13)
Deductions     (126)
Balance at End of Period 29 33 33
Product Warranty Liability [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 359 366 493
Charged to Costs and Expenses 344 62 234
Charged to Other Accounts     (85)
Deductions (77) (69) (276)
Balance at End of Period $ 626 $ 359 366
Restructuring Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period     18
Deductions     $ (18)