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STOCKHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity for the nine months ended September 30, 2021 is as follows (in thousands, except share and per share data):
| Number of Stock Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Balance at December 31, 2020 | 13,630,882 |  |  | $ | 17.84 |  |  | 3.84 |  | $ | 2,723,394 |
Granted | 198,771 |  |  | 255.22 |  |  |  |  |
Exercised | (4,417,087) |  |  | 11.64 |  |  |  |  |
Forfeited | (2,895) |  |  | 71.99 |  |  |  |  |
Balance at September 30, 2021 | 9,409,671 |  |  | $ | 25.75 |  |  | 4.19 |  | $ | 2,017,556 |
Options exercisable as of September 30, 2021 | 8,099,979 |  |  | $ | 15.57 |  |  | 3.52 |  | $ | 1,816,899 |
Restricted Stock Awards and Restricted Stock Units Activity | Activity related to RSAs and RSUs during the nine months ended September 30, 2021 is set forth below:
| Number of shares |  | Weighted Average Grant Date Fair Value
Unvested as of December 31, 2020 | 15,622,645 |  |  | $ | 71.71 |
Granted | 4,256,680 |  |  | 246.06 |
Vested | (5,179,004) |  |  | 68.22 |
Forfeited | (742,110) |  |  | 101.77 |
Unvested as of September 30, 2021 | 13,958,211 |  |  | $ | 124.57 |
Summary of the Effect of Share-Based Compensation on the Condensed Consolidated Statements of Operations | The following table summarizes the effects of share-based compensation on the Company's condensed consolidated statements of operations (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenue | $ | 99 |  |  | $ | 100 |  |  | $ | 310 |  |  | $ | 271 |
Product development | 121,209 |  |  | 78,682 |  |  | 314,265 |  |  | 205,647 |
Sales and marketing | 16,023 |  |  | 12,063 |  |  | 40,680 |  |  | 27,354 |
General and administrative | 27,680 |  |  | 19,544 |  |  | 74,744 |  |  | 50,600 |
Total | $ | 165,011 |  |  | $ | 110,389 |  |  | $ | 429,999 |  |  | $ | 283,872 |

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