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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