Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 713	$ 791	$ 684	$ 871
Provision for product warranty - expense	224	215	282	303
Adjustments and utilization of warranty accrual	(100)	(107)	(129)	(275)
Balance at end of period	$ 837	$ 899	$ 837	$ 899