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Accrued Liabilities (Tables)
 6 Months Ended
Jun. 30, 2020
Accrued Liabilities, Current [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities as of June 30, 2020 and December 31, 2019 consisted of the following (in thousands):
 
    
June 30,
2020
     
December 31,
2019
  
Accrued contract research costs
    $
 
 32,202     $  13,775  
Compensation and benefits
      1,917        2,779  
Professional fees
      862        1,177  
Other
      4,967        5,906  
  
 
 
     
 
 
  
   $ 39,948      $ 23,637