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STOCK-BASED COMPENSATION - (Tables)
3 Months Ended
Mar. 31, 2021
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 for the three months ended March 31, 2021 and 2020 (in thousands):
Three Months Ended
March 31,
20212020
Research and development$4,252 $2,839 
General and administrative3,272 2,781 
Total stock-based compensation expense$7,524 $5,620