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4. Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2020
Payables and Accruals [Abstract] |
Schedule of accrued expenses |
|  | 2020 |  |  | 2019 |
|  |  | (In thousands) |
Accrued legal expenses - patent |  | $ | 2,284 |  |  | $ | 6,181 |
Accrued consulting and other professional fees |  |  | – |  |  |  | 470 |
Short-term lease liability |  |  | 589 |  |  |  | 435 |
Other accrued liabilities |  |  | 834 |  |  |  | 179 |
|  | $ | 3,707 |  |  | $ | 7,265 |

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