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STOCK-BASED COMPENSATION
 9 Months Ended
Sep. 30, 2021
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
September 30,		Nine Months Ended
September 30,
2021202020212020
Research and development$4,935 $3,573 $14,645 $9,990 
General and administrative2,938 3,109 10,235 9,076 
Total stock-based compensation expense$7,873 $6,682 $24,880 $19,066