Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 642	$ 684
Provision for product warranty - expense	56	58
Adjustments and utilization of warranty accrual	(46)	(29)
Balance at end of period	$ 652	$ 713