Quarterly report pursuant to Section 13 or 15(d)

Product Warranties (Details)

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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Changes in Company's standard product warranty reserve [Roll Forward]        
Total product warranty reserve at the beginning of the period $ 130 $ 285 $ 130 $ 300
Warranty expense to cost of revenue 17 12 51 44
Utilization (17) (22) (51) (69)
Total product warranty reserve at the end of the period $ 130 $ 275 $ 130 $ 275