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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of 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 |
Summary of Stock Option Activity | 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 |
Summary of Restricted Stock Activity | 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 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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