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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Allocation of stock-based compensation expense        
Stock-based compensation expense $ 451 $ 145 $ 1,126 $ 645
Research and development expenses | Employees        
Allocation of stock-based compensation expense        
Stock-based compensation expense 154 64 461 230
Research and development expenses | Non-employees        
Allocation of stock-based compensation expense        
Stock-based compensation expense 13 11 32 56
General and administrative expenses | Non-employees        
Allocation of stock-based compensation expense        
Stock-based compensation expense 19 17 40 198
General and administrative expenses | Employees and directors        
Allocation of stock-based compensation expense        
Stock-based compensation expense $ 265 $ 53 $ 593 $ 161