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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Schedule of Stock Option Plan Activity | The following is a summary of our stock option and restricted stock activity and related information:
| Stock Options |  | Restricted Stock Awards
| Shares |  | Weighted-Average Exercise Price |  | Shares |  | Weighted-Average Grant Date Fair Value
Balance as of December 31, 2020 | 2,561,822 |  |  | $ | 85.59 |  |  | 206,202 |  |  | $ | 106.88 |
Granted | 363,889 |  |  | $ | 160.36 |  |  | 165,117 |  |  | $ | 170.04 |
Options exercised/RSUs vested | (564,302) |  |  | $ | 52.55 |  |  | (95,657) |  |  | $ | 126.48 |
Forfeited | (121,472) |  |  | $ | 109.27 |  |  | (9,575) |  |  | $ | 138.81 |
Balance as of September 30, 2021 | 2,239,937 |  |  | $ | 104.77 |  |  | 266,087 |  |  | $ | 137.88 |
Schedule of Restricted Stock Activity | The following is a summary of our stock option and restricted stock activity and related information:
| Stock Options |  | Restricted Stock Awards
| Shares |  | Weighted-Average Exercise Price |  | Shares |  | Weighted-Average Grant Date Fair Value
Balance as of December 31, 2020 | 2,561,822 |  |  | $ | 85.59 |  |  | 206,202 |  |  | $ | 106.88 |
Granted | 363,889 |  |  | $ | 160.36 |  |  | 165,117 |  |  | $ | 170.04 |
Options exercised/RSUs vested | (564,302) |  |  | $ | 52.55 |  |  | (95,657) |  |  | $ | 126.48 |
Forfeited | (121,472) |  |  | $ | 109.27 |  |  | (9,575) |  |  | $ | 138.81 |
Balance as of September 30, 2021 | 2,239,937 |  |  | $ | 104.77 |  |  | 266,087 |  |  | $ | 137.88 |

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