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Supplemental Financial Information - Warranty Reserve Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Activity related to warranty reserve    
Balance at beginning of fiscal year $ 569 $ 416
Additions charged to cost of sales 148 152
Warranty claims (55) (128)
Balance at end of reporting period $ 662 $ 440