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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Stock-Based Compensation Expense by Operating Expense Category | Stock-based compensation expense recorded in the condensed consolidated statements of operations was as follows (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Platform operations |  | $ | 1,234 |  |  | $ | 818 |  |  | $ | 3,137 |  |  | $ | 1,543 |
Sales and marketing |  |  | 3,033 |  |  |  | 1,500 |  |  |  | 7,757 |  |  |  | 3,277 |
Technology and development |  |  | 4,013 |  |  |  | 1,990 |  |  |  | 8,905 |  |  |  | 3,981 |
General and administrative |  |  | 3,137 |  |  |  | 1,585 |  |  |  | 8,159 |  |  |  | 3,605 |
Total |  | $ | 11,417 |  |  | $ | 5,893 |  |  | $ | 27,958 |  |  | $ | 12,406 |
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, 2017 |  |  | 4,745 |  |  | $ | 17.96 |
Granted |  |  | 1,253 |  |  |  | 59.61 |
Exercised |  |  | (1,110 | ) |  |  | 6.46 |
Cancelled |  |  | (59 | ) |  |  | 44.31 |
Outstanding as of September 30, 2018 |  |  | 4,829 |  |  | $ | 31.09 |
Exercisable as of September 30, 2018 |  |  | 2,016 |  |  | $ | 12.36 |
Summary of Nonvested Restricted Stock Activity | The following summarizes Restricted Stock activity:
|  | Shares (in thousands) |  |  | Weighted- Average Grant Date Fair Value |
Unvested as of December 31, 2017 |  |  | 418 |  |  | $ | 39.95 |
Granted |  |  | 126 |  |  |  | 57.04 |
Vested |  |  | (43 | ) |  |  | 40.92 |
Forfeited |  |  | — |  |  |  | — |
Unvested as of September 30, 2018 |  |  | 501 |  |  | $ | 44.17 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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=109197908&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=115993241&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=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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