Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 837	$ 899	$ 684	$ 871
Provision for product warranty - expense	54	185	336	488
Adjustments and utilization of warranty accrual	126	(286)	(255)	(561)
Balance at end of period	$ 765	$ 798	$ 765	$ 798