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Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended		51 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Cash and cash equivalents	$ 2,855	$ 4,326	$ 2,855	$ 4,064	$ 11,211
Working capital	16,799		16,799
Net cash used in operating activities	531	$ (1,294)
Increase of cash used in operating activities	$ 1,825
Litigation for Intellectual Property Infringement [Member]
Loss Contingencies [Line Items]
Litigation settlement expense			$ 15,314

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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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