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4. Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Payables and Accruals [Abstract] |  |
Accrued legal expenses - patent | $ 2,284 | $ 6,181
Accrued consulting and other professional fees | 0 | 470
Short-term lease liability | 589 | 435
Other accrued liabilities | 834 | 179
Total accrued expenses | $ 3,707 | $ 7,265

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