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Accrued Liabilities
 12 Months Ended
Dec. 31, 2019
Accrued Liabilities, Current [Abstract]  
Accrued Liabilities
5. Accrued Liabilities
Accrued liabilities as of December 31, 2019 and 2018 consisted of the following (in thousands):
                 
 
December 31,
2019
 
  
December 31,
2018
 
C
ontract research costs
  $
13,775
     $
571
  
Compensation and benefits
   
2,779
      
1,797
  
Professional fees
 
 
1,177
 
 
 
1,062
 
Other
   
5,906
     
2,527
 
                 
  $
23,637
    $
5,957