Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 23, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Oct. 23, 2017	Oct. 23, 2016	Sep. 30, 2015
San Francisco
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Future minimum lease payments		$ 100		$ 100
Etherios, Inc. | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Facility abandonment costs	$ 725	100
Income tax expense (benefit) on discontinued operations		$ 47	$ (161)	$ (476)	$ (888)
Etherios, Inc. | Discontinued Operations, Disposed of by Sale | United States Federal Tax Jurisdiction
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred income tax liability								$ 589
Etherios, Inc. | Discontinued Operations, Disposed of by Sale | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred receivable from sale agreement						$ 2,000	$ 3,000