Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Black-Scholes Option Pricing Model to Stock Options Granted (Details)

v3.21.1
STOCKHOLDERS' EQUITY - Black-Scholes Option Pricing Model to Stock Options Granted (Details) - Stock Options
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Expected term (years) 6 years 29 days 6 years 29 days
Expected volatility, Minimum 55.80%  
Expected volatility, Maximum 56.30%  
Expected volatility   55.80%
Risk free interest rate, Minimum 0.57% 1.48%
Risk free interest rate, Maximum 1.65% 1.81%
Expected dividends 0.00% 0.00%