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Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2022
Prepaid Expense and Other Assets, Current [Abstract]  
Prepaid Expenses and Other Current Assets
4. Prepaid expenses and other current assets
Prepaid expenses and other current assets consisted of the following:
 
    
December 31,
2022
     
December 31,
2021
  
Rent and deposits
    $ —        $ 470  
Research and development expenses
      2,084        858  
Accounts receivable
      449        144  
Insurance
      1,608        2,384  
Other
      255        185  
  
 
 
     
 
 
  
Total
    $ 4,396      $ 4,041