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
Mar. 31, 2020
Mar. 31, 2019
Allocation of stock-based compensation expense    
Stock compensation expense $ 1,379 $ 1,354
Research and development expenses    
Allocation of stock-based compensation expense    
Stock compensation expense 648 633
General and administrative expenses    
Allocation of stock-based compensation expense    
Stock compensation expense $ 731 $ 721