Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Weighted Average Assumptions (Details)

v3.21.2
Stock-based Compensation - Weighted Average Assumptions (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Weighted average assumptions        
Number of shares, Granted   0 213,711  
Stock Options [Member]        
Weighted average assumptions        
Dividend yield 0.00%   0.00% 0.00%
Expected volatility 71.00%   90.00% 100.00%
Risk-free interest rate 0.85%   0.79% 0.77%
Expected term 5 years 7 months 9 days   5 years 8 months 1 day 5 years 7 months 28 days