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Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Movement in Extended Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 1,752 $ 2,026 $ 1,769 $ 2,344
Change in accruals for warranties during the period 213 86 317 127
Settlements during the period (205) (260) (326) (619)
Balance at end of period $ 1,760 $ 1,852 $ 1,760 $ 1,852