Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

v3.20.1
Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Reserve for Doubtful Accounts Receivable [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 33 $ 339 $ 168
Charged to Costs and Expenses   (167) 177
Charged to Other Accounts   (13)  
Deductions   (126) (6)
Balance at End of Period 33 33 339
Product Warranty Liability [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 366 493 538
Charged to Costs and Expenses 62 234 527
Charged to Other Accounts   (85)  
Deductions (69) (276) (572)
Balance at End of Period $ 359 366 493
Restructuring Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period   18 120
Charged to Costs and Expenses     316
Deductions   $ (18) (418)
Balance at End of Period     $ 18