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Product Warranty Liability - Reconciliation of the Changes in Product Warranty Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Guarantees [Abstract]        
Balance at beginning of period $ 308 $ 348 $ 359 $ 366
Expense for product warranties 28 67 23 96
Product warranty claims paid (21) (3) (67) (50)
Balance at end of period $ 315 $ 412 $ 315 $ 412