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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock-based compensation expense by operating expense category | Total stock-based compensation expense, by operating expense category, in the condensed consolidated statements of operations was as follows (in thousands):
|  | Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
Platform operations |  | $ | 229 |  |  | $ | 15 |
Sales and marketing |  |  | 539 |  |  |  | 50 |
Technology and development |  |  | 665 |  |  |  | 40 |
General and administrative |  |  | 889 |  |  |  | 54 |
Total |  | $ | 2,322 |  |  | $ | 159 |
Summary of stock option activity | Stock option activity for the three months ended March 31, 2017 was as follows:
|  | Shares Under Option (in thousands) |  |  | Weighted- Average Exercise Price |
Outstanding at December 31, 2016(1) |  |  | 5,429 |  |  | $ | 4.94 |
Granted |  |  | 44 |  |  |  | 29.60 |
Exercised |  |  | (680 | ) |  |  | 0.40 |
Cancelled |  |  | (126 | ) |  |  | 20.10 |
Outstanding as of March 31, 2017(2) |  |  | 4,667 |  |  | $ | 5.43 |
Exercisable as of March 31, 2017 |  |  | 2,710 |  |  | $ | 1.13 |
| (1) | Includes options to purchase 389 and 5,040 shares of Class A and Class B common stock, respectively.
| (2) | Includes options to purchase 393 and 4,274 shares of Class A and Class B common stock, respectively.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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