Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 652	$ 713	$ 642	$ 684
Provision for product warranty - expense	49	224	105	282
Adjustments and utilization of warranty accrual	(102)	(100)	(148)	(129)
Balance at end of period	$ 599	$ 837	$ 599	$ 837