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4. Accrued Expenses
12 Months Ended
Dec. 31, 2022
Payables and Accruals [Abstract]  
4. Accrued Expenses

4. Accrued Expenses

 

The components of accrued expenses as of December 31, 2022 and 2021 are as follows (in thousands):

 

   2022   2021 
   Years Ended December 31, 
   2022   2021 
Clinical trial  $88   $358 
Employee benefits   475    33 
Other   5    22 
Total accrued expenses  $568   $413