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Accrued Liabilities
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Accrued Liabilities, Current [Abstract]    
Accrued Liabilities
8. Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
 
    
March 31,
2022
    
December 31,
2021
 
Research and development accrued expenses
   $ 12,129      $ 6,626  
Accrued offering costs
            1,301  
Accrued bonus
     793        3,429  
Other liabilities
     1,478        1,824  
  
 
 
    
 
 
 
Total accrued liabilities
   $ 14,400      $ 13,180  
  
 
 
    
 
 
 
9. Accrued Liabilities
Accrued liabilities consist of the following (in thousands):
 
    
December 31,
 
    
2021
    
2020
 
Research and development accrued expenses
   $ 6,626      $ 2,060  
Accrued offering costs
     1,301        576  
Accrued bonus
     3,429        1,113  
Accrued vacation
     344        249  
Other liabilities
     1,480        578  
  
 
 
    
 
 
 
Total accrued liabilities
   $ 13,180      $ 4,576