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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Schedule of Shares of Common Stock Reserved for Future Issuance | As of December 31, 2021, shares of common stock reserved for future issuance are as follows (in thousands):
Stock options, RSUs and PSUs outstanding | 23,922 |
Shares available for future grant under the 2017 Performance Incentive Plan | 1,142 |
Shares available for issuance under the employee stock purchase plan | 1,043 |
Total common stock reserved for issuance | 26,107 |
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,
| 2021 |  | 2020 |  | 2019
Average risk-free interest rate | 1.2 | % |  | 0.4 | % |  | 1.8 | %
Dividend yield | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Average volatility factor | 63.8 | % |  | 64.1 | % |  | 62.2 | %
Weighted-average expected life | 5.5 years |  | 5.6 years |  | 5.6 years
Weighted-average grant-date fair value of options granted | $ | 8.07 |  | $ | 10.70 |  | $ | 12.25

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