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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
Equity [Abstract] |
Schedule of Shares of Common Stock Reserved for Future Issuance | As of December 31, 2022, shares of common stock reserved for future issuance are as follows (in thousands):
Stock options, RSUs and PSUs outstanding | 23,589 |
Shares available for future grant under the 2017 Performance Incentive Plan | 2,973 |
Shares available for issuance under the employee stock purchase plan | 841 |
Total common stock reserved for issuance | 27,403 |
The following table lists the Black-Scholes option-pricing model assumptions used to calculate the fair value of employee and director stock options, as well as the resulting grant-date fair value:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Average risk-free interest rate | 2.9 | % |  | 1.2 | % |  | 0.4 | %
Dividend yield | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Average volatility factor | 77.9 | % |  | 63.8 | % |  | 64.1 | %
Weighted-average expected life | 5.6 years |  | 5.5 years |  | 5.6 years
Weighted-average grant-date fair value of options granted | $ | 3.18 |  | $ | 8.07 |  | $ | 10.70

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