Geographical Information (Schedule of Revenue by Geographic Region) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 23,018	$ 21,194	$ 19,057	$ 18,416	$ 14,302	$ 13,596	$ 12,953	$ 14,663	$ 81,685	$ 55,514	$ 60,971
United States [Member]
Segment Reporting Information [Line Items]
Revenue									55,736	37,284	45,228
Asia [Member]
Segment Reporting Information [Line Items]
Revenue									16,885	8,652	11,583
Europe [Member]
Segment Reporting Information [Line Items]
Revenue									8,249	7,746	3,729
Other [Member]
Segment Reporting Information [Line Items]
Revenue									$ 815	$ 1,832	$ 431