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8. Accrued Expenses
 6 Months Ended
Jun. 30, 2022
Payables and Accruals [Abstract]  
8. Accrued Expenses

8. Accrued Expenses

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

Schedule of Accrued Liabilities

             
      June 30,     December 31,
      2022     2021
Professional fees   $ 250    $ 181 
Personnel related     619      1,303 
Outside research and development services     2,439      2,219 
Insurance     333      - 
Other     79      25 
     Accrued expenses, net   $ 3,720    $ 3,728