Stockholders' Equity (Assumptions Used to Estimate Fair Value of Stock Options and Performance Stock and Employee Stock Purchase Plan) (Details) |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2022 |
Sep. 30, 2021 |
|
Stock options | ||||
Weighted average assumptions | ||||
Risk-free interest rate | 3.10% | 0.90% | 2.00% | 1.00% |
Volatility | 97.50% | 96.00% | 96.10% | 95.80% |
Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |
Expected term (years) | 6 years 1 month 6 days | 6 years 1 month 6 days | 6 years 1 month 6 days | 6 years 1 month 6 days |
Performance stock options | ||||
Weighted average assumptions | ||||
Risk-free interest rate | 0.00% | 0.00% | 0.00% | 1.00% |
Volatility | 0.00% | 0.00% | 0.00% | 95.70% |
Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |
Expected term (years) | 0 months | 0 months | 0 months | 6 years 1 month 6 days |
Employee stock purchase plan shares | ||||
Weighted average assumptions | ||||
Risk-free interest rate | 1.70% | 0.10% | 0.90% | 0.10% |
Volatility | 105.90% | 103.10% | 99.30% | 104.40% |
Dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |
Expected term (years) | 6 months | 6 months | 6 months | 6 months |