Accrued Expenses and Other Current Liabilities (Schedule of Product Warranty Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 791	$ 1,564	$ 871	$ 1,664
Provision for product warranty - expense	215	88	303	234
Adjustments and utilization of warranty accrual	107	550	(275)	(796)
Balance at end of period	$ 899	$ 1,102	$ 899	$ 1,102