Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Payables And Accruals [Abstract]
Product warranty	$ 508	$ 392	$ 2,326	$ 951
Compensated absences	1,287	1,509	1,653
Legal and professional fees	194	218	277
Payroll	682	692	581
Property and sales taxes	2,383	3,234	2,909
Medical claims	550	624	763
Employee bonuses			36
Other	734	1,180	1,134
Accrued expenses and other current liabilities	$ 6,338	$ 7,849	$ 9,679