Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Summary of Stock Options Pricing (Details)

v3.21.2
SHARE-BASED COMPENSATION - Summary of Stock Options Pricing (Details) - Stock Option
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Expected volatility, minimum 61.12% 70.98%
Expected volatility, maximum 68.74% 76.97%
Risk free interest rate, minimum 0.48% 0.27%
Risk free interest rate, maximum 0.98% 1.39%
Expected life (years) 5 years 5 years