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Prepaid Expenses, Other Current Assets and Other Noncurrent Assets
12 Months Ended
Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]  
Prepaid Expenses, Other Current Assets and Other Noncurrent Assets
5. Prepaid Expenses, Other Current Assets and Other Noncurrent Assets
Prepaid expenses and other current assets consisted of the following as of (in thousands):
 
    
December 31,
 
    
2023
    
2022
 
Payroll tax credit
  
$
755
 
   $ 948  
Prepaid external research and development
  
 
1,834
 
     1,329  
Research credit receivable
  
 
— 
 
     116  
Prepaid expenses
  
 
427
 
     421  
Other
  
 
83
 
     146  
  
 
 
    
 
 
 
Total prepaid expenses and other current assets
  
$
3,099
 
  
$
2,960
 
  
 
 
    
 
 
 
Other noncurrent assets consisted of the following as of (in thousands):
 
    
December 31,
 
    
2023
    
2022
 
Deferred transaction costs
  
$
3,912
 
   $  
Prepaid external research and development—long term
  
 
676
 
      
Other
  
 
23
 
     108  
  
 
 
    
 
 
 
Total other noncurrent assets
  
$
4,611
 
  
$
108