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Restricted Cash (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Abstract]    
Schedule of Cash and Cash Equivalents and Restricted Cash
The following table reconciles cash and cash equivalents and restricted cash per the balance sheets to the statements of cash flows (in thousands):
 
    
March 31,
2022
    
March 31,
2021
 
Cash and cash equivalents
   $ 127,160      $ 117,651  
Restricted cash
     199        199  
  
 
 
    
 
 
 
Total
   $ 127,359      $ 117,850  
  
 
 
    
 
 
 
The following table reconciles cash and cash equivalents and restricted cash per the balance sheets to the statements of cash flows (in thousands):
 
    
December 31,
 
    
2021
    
2020
 
Cash and cash equivalents
   $ 30,833      $ 46,596  
Restricted cash
     199        199  
  
 
 
    
 
 
 
Total
   $ 31,032      $ 46,795