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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Share-based Compensation Expense
Share-based Compensation Expense

Total stock-based compensation expense related to stock options granted under the 2009 Plan was allocated as follows (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Research and development
$
81

 
$
76

 
$
237

 
$
263

General and administrative
243

 
75

 
770

 
253

Total stock-based compensation expense
$
324

 
$
151

 
$
1,007

 
$
516