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Discontinued Operations (Income from Discontinued Operations, after Income Taxes) (Details) - Etherios, Inc. - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Service revenue $ 0 $ 891
Cost of service 0 713
Gross profit 0 178
Operating expenses:    
Sales and marketing 0 148
Research and development 0 103
General and administrative 0 43
Total operating expenses 0 294
Loss from discontinued operations, before income taxes 0 (116)
(Loss) gain on sale of discontinued operations, before income taxes (42) 2,870
Total (loss) income from discontinued operations, before income taxes (42) 2,754
Income tax expense (benefit) on discontinued operations 47 (476)
(Loss) income from discontinued operations, after income taxes $ (89) $ 3,230