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Business Description, Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 6 Months Ended | 54 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 2,106 | $ 2,352 | $ 2,106 | $ 4,064 | $ 11,211
Working capital | 13,765 |  | 13,765 |  |
Net cash used in operating activities | 113 | $ (1,398) |  |  |
Increase of cash used in operating activities | $ 1,511 |  |  |  |
Litigation for Intellectual Property Infringement [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation settlement expense |  |  | $ 17,383 |  |

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