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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2018
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 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 |
Stock Options 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 |
On January 1, 2018, the number of shares authorized for grant under the Company’s 2016 Incentive Award Plan was increased by 1.7 million shares in accordance with plan provisions. Restricted Stock and Restricted Stock Units (“Restricted Stock”) 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 |
Employee Stock Purchase Plan (“ESPP”) Stock-based compensation expense related to the ESPP totaled $4.4 million and $3.2 million for the three months ended September 30, 2018 and 2017, respectively. Stock-based compensation expense related to the ESPP totaled $11.0 million and $6.1 million for the nine months ended September 30, 2018 and 2017, respectively. On January 1, 2018, the number of shares available for issuance under the Company’s Employee Stock Purchase Plan was increased by 0.4 million shares in accordance with plan provisions.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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