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Accrued Liabilities
 6 Months Ended
Jun. 30, 2022
Payables and Accruals [Abstract]  
Accrued Liabilities

5. Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

 

 

 

June 30,

 

 

December 31,

 

 

 

2022

 

 

2021

 

Research and development expenses

 

$

5,098

 

 

$

5,723

 

Employee compensation and benefits

 

 

1,759

 

 

 

1,907

 

Professional services and other

 

 

1,923

 

 

 

807

 

Total accrued liabilities

 

$

8,780

 

 

$

8,437