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Accounts Payable and Accrued Expenses - Schedule of Product Warranty Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Movement in Extended Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 1,760 $ 1,852 $ 1,769 $ 2,344
Change in accruals for warranties during the period 260 25 577 152
Settlements during the period (524) (406) (850) (1,025)
Balance at end of period $ 1,496 $ 1,471 $ 1,496 $ 1,471