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
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Expected volatility   70.98%
Expected volatility, minimum 63.50%  
Expected volatility, maximum 68.74%  
Risk-free interest rate   1.39%
Risk free interest rate, minimum 0.48%  
Risk free interest rate, maximum 0.87%  
Expected life (years) 5 years 5 years