Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Detail)

v3.19.1
Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Reserve for Doubtful Accounts Receivable [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 339 $ 168 $ 91
Charged to Costs and Expenses (167) 177 91
Charged to Other Accounts (13)    
Deductions (126) (6) (14)
Balance at End of Period 33 339 168
Product Warranty Liability [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 493 538 686
Charged to Costs and Expenses 234 527 106
Charged to Other Accounts (85)    
Deductions (276) (572) (254)
Balance at End of Period 366 493 538
Restructuring Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 18 120 74
Charged to Costs and Expenses   316 630
Deductions $ (18) (418) (584)
Balance at End of Period   $ 18 $ 120