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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 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 | 318,381 |  |  | $ | 164.30 |  |  | 158,456 |  |  | $ | 171.44 |
Options exercised/RSUs vested | (533,451) |  |  | $ | 52.00 |  |  | (95,607) |  |  | $ | 126.49 |
Forfeited | (83,489) |  |  | $ | 106.98 |  |  | (6,790) |  |  | $ | 126.23 |
Balance as of June 30, 2021 | 2,263,263 |  |  | $ | 103.79 |  |  | 262,261 |  |  | $ | 138.23 |
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 | 318,381 |  |  | $ | 164.30 |  |  | 158,456 |  |  | $ | 171.44 |
Options exercised/RSUs vested | (533,451) |  |  | $ | 52.00 |  |  | (95,607) |  |  | $ | 126.49 |
Forfeited | (83,489) |  |  | $ | 106.98 |  |  | (6,790) |  |  | $ | 126.23 |
Balance as of June 30, 2021 | 2,263,263 |  |  | $ | 103.79 |  |  | 262,261 |  |  | $ | 138.23 |

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