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Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 6 Months Ended | 66 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 2,088 | $ 2,106 | $ 2,088 | $ 3,803 | $ 4,064
Working capital | 17,567 |  | 17,567 |  |
Net cash used in operating activities | 985 | $ 113 |  |  |
Increase of cash used in operating activities | $ 872 |  |  |  |
Litigation for Intellectual Property Infringement [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement expense |  |  | $ 23,559 |  |

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