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STOCK-BASED COMPENSATION - (Tables)
6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense The following table shows total stock-based compensation expense included in the Condensed Consolidated Statements of Operations (in thousands):
Three Months Ended
June 30,
Six Months Ended
June 30,
2022202120222021
Research and development$4,591 $5,458 $9,261 $9,710 
General and administrative3,327 4,025 6,348 7,297 
Total stock-based compensation expense$7,918 $9,483 $15,609 $17,007