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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Movement in Extended Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 2,026 $ 2,774 $ 2,344 $ 3,601
Change in accruals for warranties during the period 86 316 127 417
Settlements during the period (260) (396) (619) (1,324)
Balance at end of period $ 1,852 $ 2,694 $ 1,852 $ 2,694