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Basis of Presentation (Details) - USD ($)			3 Months Ended	9 Months Ended		12 Months Ended
Basis of Presentation (Details) - USD ($)	Aug. 16, 2018	Aug. 13, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2019	Sep. 15, 2018	Dec. 31, 2017	Sep. 28, 2017	Jan. 23, 2017
Related Party Transaction [Line Items]
Proceeds from sale of disposal group				$ 5,000,000	$ 0
Proceeds from stock purchase agreement	$ 2,775,000.00
Working capital			$ (4,800,000)	(4,800,000)
Cash balance and short-term investments			6,300,000	6,300,000
Required contributions by employer			1,700,000	1,700,000			$ 1,700,000	$ 0
Corporate, Non-Segment \| Scenario, Forecast
Related Party Transaction [Line Items]
Decrease in expected cash flows						$ 500,000
ECJ Copyright Levy
Related Party Transaction [Line Items]
Levy accruals			5,400,000	5,400,000				$ 5,600,000
ECJ Copyright Levy \| Corporate, Non-Segment
Related Party Transaction [Line Items]
Levy accruals			5,100,000	$ 5,100,000
NXSN
Related Party Transaction [Line Items]
Noncontrolling interest, percentage held by parent										50.00%
Senior secured convertible promissory note										$ 25,000,000
IOENGINE Note \| Notes Payable, Other Payables
Related Party Transaction [Line Items]
Debt instrument, principal amount									$ 4,000,000
Repayments of notes payable	2,250,000	$ 2,250,000
Discontinued Operations, Disposed of by Sale \| NXSN
Related Party Transaction [Line Items]
Disposal group consideration	5,675,000
Proceeds from sale of disposal group			$ 5,700,000
Escrow deposit	$ 650,000
Escrow deposit duration	18 months
Call Option \| NXSN \| Common Stock \| Humilis
Related Party Transaction [Line Items]
Option to purchase shares (in shares)	140,000,500
Call Option \| NXSN \| Preferred Stock \| Humilis
Related Party Transaction [Line Items]
Option to purchase shares (in shares)	5,600,000