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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Revenue | $ 118,825 | $ 79,413 | $ 316,826 | $ 205,569
Type of Revenue [Extensible List] | us-gaap:ServiceMember | us-gaap:ServiceMember | us-gaap:ServiceMember | us-gaap:ServiceMember
Operating expenses: |  |  |  |
Platform operations | $ 29,344 | $ 17,397 | $ 78,842 | $ 45,097
Type of Cost, Good or Service [Extensible List] | us-gaap:ServiceMember | us-gaap:ServiceMember | us-gaap:ServiceMember | us-gaap:ServiceMember
Sales and marketing | $ 23,287 | $ 16,200 | $ 60,007 | $ 42,842
Technology and development | 22,621 | 13,181 | 59,806 | 35,777
General and administrative | 21,310 | 14,227 | 59,816 | 41,815
Total operating expenses | 96,562 | 61,005 | 258,471 | 165,531
Income from operations | 22,263 | 18,408 | 58,355 | 40,038
Other expense (income): |  |  |  |
Interest expense (income), net | (237) | 513 | (113) | 1,290
Foreign currency exchange loss, net | 395 | 1,841 | 2,035 | 3,159
Total other expense, net | 158 | 2,354 | 1,922 | 4,449
Income before income taxes | 22,105 | 16,054 | 56,433 | 35,589
Provision for income taxes | 1,813 | 5,825 | 7,728 | 1,602
Net income | $ 20,292 | $ 10,229 | $ 48,705 | $ 33,987
Earnings per share: |  |  |  |
Basic | $ 0.47 | $ 0.25 | $ 1.15 | $ 0.85
Diluted | $ 0.44 | $ 0.23 | $ 1.07 | $ 0.77
Weighted average shares outstanding: |  |  |  |
Basic | 42,721 | 40,700 | 42,178 | 39,977
Diluted | 46,576 | 44,245 | 45,460 | 43,919

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