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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Stockholders' Equity Note [Abstract] |
Summary of Stock Option Activity | The following tables summarize the activity under the Stock Plan:
| Outstanding Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years)
Balance at December 31, 2020 | 8,222,710 |  |  | $ | 0.19 |  |  | 8.30
Granted | — |  |  | $ | — |  |  |
Exercised | (118,019) |  |  | 0.46 |  |  |
Forfeited / canceled | — |  |  | — |  |  |
Balance as of March 31, 2021 | 8,104,691 |  |  | $ | 0.19 |  |  | 8.06
Granted | — |  |  |  |  |
Exercised | — |  |  |  |  |
Forfeited / Canceled | (158,735) |  |  | $ | 0.14 |  |  |
Balance as of June 30, 2021 | 7,945,956 |  |  | $ | 0.19 |  |  | 7.78
Granted | — |  |  |  |  |
Exercised | (6,215) |  |  | $ | 0.36 |  |  |
Forfeited / Canceled | — |  |  |  |  |
Balance as of September 30, 2021 | 7,939,741 |  |  | $ | 0.19 |  |  | 7.53
Vested and expected to vest at September 30, 2021 | 7,108,987 |  |  |  |  |

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