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Prepaid Expenses and Other Current Assets (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]    
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist of the following (in thousands):
 
    
March 31,
2022
    
December 31,
2021
 
Prepaid research and development costs
   $ 6,388      $ 6,143  
Other prepaid expense and current assets
     3,586        2,049  
  
 
 
    
 
 
 
Total prepaid expenses and other current assets
   $ 9,974      $ 8,192  
  
 
 
    
 
 
 
Prepaid expenses and other current assets consist of the following (in thousands):
 
    
December 31,
 
    
2021
    
2020
 
Prepaid research and development costs
   $ 6,143      $ 1,551  
Other prepaid expense and current assets
     2,049        1,210  
  
 
 
    
 
 
 
Total prepaid expenses and other current assets
   $ 8,192      $ 2,761