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STOCK-BASED COMPENSATION
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATIONThe following table shows total stock-based compensation expense included in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2020 and 2019 (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Research and development$3,578  $2,763  $6,417  $5,061  
General and administrative3,186  2,104  5,967  4,329  
Total stock-based compensation expense$6,764  $4,867  $12,384  $9,390