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STOCK-BASED COMPENSATION
 3 Months Ended
Mar. 31, 2022
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 (in thousands):
Three Months Ended
March 31,
20222021
Research and development$4,670 $4,252 
General and administrative3,021 3,272 
Total stock-based compensation expense$7,691 $7,524