Geographical Information (Schedule of Revenue by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 25,600	$ 22,376	$ 21,532	$ 22,490	$ 23,018	$ 21,194	$ 19,057	$ 18,416	$ 91,998	$ 81,685	$ 55,514
United States [Member]
Segment Reporting Information [Line Items]
Revenue									66,436	55,736	37,284
Asia [Member]
Segment Reporting Information [Line Items]
Revenue									17,401	16,885	8,652
Europe [Member]
Segment Reporting Information [Line Items]
Revenue									7,618	8,249	7,746
Other [Member]
Segment Reporting Information [Line Items]
Revenue									$ 543	$ 815	$ 1,832