Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Common Stock to Employees (Details)

v3.21.2
STOCK BASED COMPENSATION - Common Stock to Employees (Details) - Employee
3 Months Ended 9 Months Ended
Sep. 30, 2021
$ / shares
Sep. 30, 2021
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate, Minimum 0.30% 0.30%
Risk-free interest rate, Maximum 1.70% 1.70%
Expected volatility, Minimum 52.70% 52.70%
Expected volatility, Maximum 54.20% 54.20%
Expected life, Minimum (in years) 5 years 10 months 24 days 5 years 10 months 24 days
Expected life, Maximum (in years) 6 years 3 months 18 days 6 years 3 months 18 days
Fair value of Common Stock $ 3.34 $ 3.34