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Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		63 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Cash and cash equivalents	$ 2,034	$ 2,855	$ 2,034	$ 3,803	$ 4,064
Working capital	19,520		19,520
Net cash used in operating activities	13	$ (531)
Decrease of cash used in operating activities	$ 544
Litigation for Intellectual Property Infringement [Member]
Loss Contingencies [Line Items]
Litigation settlement expense			$ 21,985

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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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