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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock-Based Compensation | Note 7—Stock-Based Compensation Stock-Based Compensation Expense Stock-based compensation expense recorded in the condensed consolidated statements of income was as follows (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Platform operations |  | $ | 2,518 |  |  | $ | 1,639 |  |  | $ | 11,624 |  |  | $ | 5,459 |
Sales and marketing |  |  | 9,099 |  |  |  | 6,916 |  |  |  | 37,362 |  |  |  | 18,549 |
Technology and development |  |  | 11,269 |  |  |  | 7,911 |  |  |  | 41,337 |  |  |  | 24,345 |
General and administrative |  |  | 11,573 |  |  |  | 10,386 |  |  |  | 41,687 |  |  |  | 25,398 |
Total |  | $ | 34,459 |  |  | $ | 26,852 |  |  | $ | 132,010 |  |  | $ | 73,751 |
Stock Options The following summarizes stock option activity:
|  | Shares Under Option (in thousands) |  |  | Weighted- Average Exercise Price |
Outstanding as of December 31, 2020 |  |  | 26,481 |  |  | $ | 10.73 |
Granted |  |  | 1,171 |  |  |  | 74.52 |
Exercised |  |  | (5,004 | ) |  |  | 7.91 |
Cancelled |  |  | (1,186 | ) |  |  | 18.20 |
Outstanding as of September 30, 2021 |  |  | 21,462 |  |  | $ | 14.45 |
Exercisable as of September 30, 2021 |  |  | 13,962 |  |  | $ | 7.97 |
Restricted Stock The following summarizes restricted stock activity:
|  | RSU (in thousands) |  |  | Weighted- Average Grant Date Fair Value |
Unvested as of December 31, 2020 |  |  | 5,698 |  |  | $ | 26.10 |
Granted |  |  | 2,166 |  |  |  | 73.70 |
Vested |  |  | (1,494 | ) |  |  | 22.41 |
Forfeited |  |  | (575 | ) |  |  | 28.72 |
Unvested as of September 30, 2021 |  |  | 5,795 |  |  | $ | 44.58 |
Employee Stock Purchase Plan (“ESPP”) Stock-based compensation expense related to the ESPP totaled $4.1 million and $3.7 million for the three months ended September 30, 2021 and 2020, respectively. Stock-based compensation expense related to the ESPP totaled $46.1 million and $17.8 million for the nine months ended September 30, 2021 and 2020, respectively.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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