Annual report pursuant to Section 13 and 15(d)

8. STOCKHOLDERS' EQUITY (Details)

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8. STOCKHOLDERS' EQUITY (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dividend yield 0.00% 0.00%
Minimum [Member]    
Expected Term 5 years 9 months 18 days 5 years 9 months 18 days
Volatility 54.00% 56.00%
Risk-free interest rate 2.40% 1.77%
Maximum [Member]    
Expected Term 6 years 3 months 18 days 6 years 3 months 18 days
Volatility 57.00% 64.00%
Risk-free interest rate 3.11% 2.29%