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STOCK-BASED COMPENSATION
9 Months Ended
Sep. 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 nine months ended September 30, 2020 and 2019 (in thousands):
Three Months Ended
September 30,
Nine Months Ended
September 30,
2020201920202019
Research and development$3,573 $2,268 $9,990 $7,329 
General and administrative3,109 2,433 9,076 6,762 
Total stock-based compensation expense$6,682 $4,701 $19,066 $14,091