Segment Data and Related Information - Schedule of Revenue by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 43,738	$ 44,582	$ 42,247	$ 44,211	$ 43,091	$ 33,473	$ 42,277	$ 49,306	$ 174,778	$ 168,147	$ 163,781
United States
Segment Reporting Information [Line Items]
Revenue									111,428	107,341	111,962
Asia
Segment Reporting Information [Line Items]
Revenue									40,244	44,373	27,519
Europe
Segment Reporting Information [Line Items]
Revenue									21,196	15,318	15,032
Other
Segment Reporting Information [Line Items]
Revenue									$ 1,910	$ 1,115	$ 9,268