Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Estimated Fair Value of Stock Options) (Details)

v3.19.2
STOCK-BASED COMPENSATION (Estimated Fair Value of Stock Options) (Details) - Common stock options - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividend Yield     0.00% 0.00%
Expected Volatility     70.00% 70.00%
Expected Life     7 years 7 years
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate     1.92% 2.50%
Exercise price range, lower limit (in dollars per share)       $ 4.12
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate     2.62% 2.89%
Exercise price range, upper limit (in dollars per share)       $ 5.96
Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price range, lower limit (in dollars per share)     $ 1.52 4.12
Exercise price range, upper limit (in dollars per share)     $ 3.15 $ 5.96
Forfeitures rate 10.00% 6.00% 10.00% 6.00%