Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Equity Based Compensation Schedule) (Details)

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STOCK-BASED COMPENSATION (Equity Based Compensation Schedule) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Allocation of stock-based compensation expense        
Stock compensation expense $ 1,473 $ 1,389 $ 4,463 $ 4,200
Research and development expenses        
Allocation of stock-based compensation expense        
Stock compensation expense 645 703 2,163 2,026
General and administrative expenses        
Allocation of stock-based compensation expense        
Stock compensation expense $ 828 $ 686 $ 2,300 $ 2,174