Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Fair Value Assumptions (Details)

v3.19.3
STOCK BASED COMPENSATION - Fair Value Assumptions (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]        
Volatility 65.01% 105.00% 65.01% 105.00%
Expected term (in years) 6 years 6 years 6 years 6 years
Risk-free rate 2.37% 2.24% 2.37% 2.24%
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Weighted-average grant date fair value per option (in dollars per share) $ 1.76 $ 2.24 $ 1.76 $ 2.24