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Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	9 Months Ended		69 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Cash and cash equivalents	$ 9,161	$ 5,583	$ 9,161	$ 3,803	$ 4,064
Working capital	23,739		23,739
Net cash used in operating activities	(1,477)	$ (309)
Increase of cash used in operating activities	$ (1,168)
Litigation for Intellectual Property Infringement [Member]
Loss Contingencies [Line Items]
Litigation settlement expense			$ 25,668

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Amount of increase (decrease) in the amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of a company's current assets minus the amount of its current liabilities.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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