Annual report pursuant to Section 13 and 15(d)

8. STOCK-BASED INCENTIVE PLANS (Details)

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8. STOCK-BASED INCENTIVE PLANS (Details) - Stock Options - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Volatility 95.00% 96.00%
Riskā€“free interest rate 1.99% 2.82%
Dividend yield 0.00% 0.00%
Expected life of options (in years) 6 years 29 days 5 years 9 months 11 days
Weighted-average fair value of common stock $ 7.45 $ 10.80