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STOCK-BASED COMPENSATION
3 Months Ended
Mar. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
The following table shows total stock-based compensation expense included in the Condensed Consolidated Statements of Operations for the three months ended March 31, 2020 and 2019 (in thousands):
Three Months Ended
March 31,
20202019
Research and development$2,839  $2,298  
General and administrative2,781  2,225  
Total stock-based compensation expense$5,620  $4,523