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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allocation of stock-based compensation expense        
Stock compensation expense $ 1,368 $ 666 $ 3,958 $ 2,024
Research and development expenses        
Allocation of stock-based compensation expense        
Stock compensation expense 686 324 2,033 900
Research and development expenses | Employees        
Allocation of stock-based compensation expense        
Stock compensation expense 672 304 1,975 839
Research and development expenses | Non-employees        
Allocation of stock-based compensation expense        
Stock compensation expense 14 20 58 61
General and administrative expenses        
Allocation of stock-based compensation expense        
Stock compensation expense 682 342 1,925 1,124
General and administrative expenses | Employees and directors        
Allocation of stock-based compensation expense        
Stock compensation expense 337 314 1,471 998
General and administrative expenses | Non-employees        
Allocation of stock-based compensation expense        
Stock compensation expense $ 345 $ 28 $ 454 $ 126