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8. Accrued Expenses
 3 Months Ended
Mar. 31, 2022
Payables and Accruals [Abstract]  
8. Accrued Expenses

8. Accrued Expenses

Accrued expenses are comprised of the following (in thousands):

Schedule of Accrued Liabilities

             
      March 31,     December 31,
      2022     2021
Professional fees   $ 190    $ 181 
Personnel related     332      1,303 
Outside research and development services     2,387      2,219 
Insurance     580      - 
Other     60      25 
     Accrued expenses, net   $ 3,549    $ 3,728