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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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Guarantees [Abstract]        
Balance at beginning of period $ 348 $ 349 $ 366 $ 493
Expense for product warranties 67 76 96 87
Product warranty claims paid (3) (15) (50) (170)
Balance at end of period $ 412 $ 410 $ 412 $ 410