Geographical Information (Schedule of Revenue by Geographic Region) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 19,057	$ 12,953	$ 37,473	$ 27,616
United States
Segment Reporting Information [Line Items]
Revenue	13,063	8,149	26,413	18,593
Asia
Segment Reporting Information [Line Items]
Revenue	3,901	2,811	6,598	4,979
Europe
Segment Reporting Information [Line Items]
Revenue	1,950	1,847	4,027	3,511
Other
Segment Reporting Information [Line Items]
Revenue	$ 143	$ 146	$ 435	$ 533