Quarterly report pursuant to Section 13 or 15(d)

Stock Plans - Fair value of stock options (Details)

v3.22.2
Stock Plans - Fair value of stock options (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Stock Plans        
Weighted-average risk-free interest rate 0.00% 0.00% 1.50% 0.50%
Expected dividend payments $ 0 $ 0 $ 0 $ 0
Expected holding period (years) 0 years 0 years 5 years 4 months 24 days 5 years 6 months
Weighted-average volatility factor 0.00% 0.00% 1.13% 1.14%
Estimated forfeiture rates for options granted 0.00% 0.00% 5.00% 30.00%