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Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | --- | ---
Payables And Accruals [Abstract] |  |  |  |
Product warranty | $ 688 | $ 508 | $ 392 | $ 2,326
Compensated absences | 1,329 | 1,287 |  |
Legal and professional fees | 434 | 194 |  |
Payroll | 960 | 682 |  |
Property and sales taxes | 1,977 | 2,383 |  |
Medical claims | 450 | 550 |  |
Other | 988 | 734 |  |
Accrued expenses and other current liabilities | $ 6,826 | $ 6,338 |  |

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