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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Revenue $ 79,413 $ 52,956 $ 205,569 $ 130,516
Operating expenses:        
Platform operations 17,397 10,422 45,097 26,617
Sales and marketing 16,200 11,600 42,842 31,282
Technology and development 13,181 7,292 35,777 17,694
General and administrative 14,227 8,591 41,815 21,442
Total operating expenses 61,005 37,905 165,531 97,035
Income from operations 18,408 15,051 40,038 33,481
Interest expense 513 1,347 1,290 2,664
Change in fair value of preferred stock warrant liabilities   4,653   9,458
Foreign currency exchange loss, net 1,841 87 3,159 489
Total other expense, net 2,354 6,087 4,449 12,611
Income before income taxes 16,054 8,964 35,589 20,870
Provision for income taxes 5,825 5,320 1,602 10,668
Net income 10,229 3,644 33,987 10,202
Net income (loss) attributable to common stockholders $ 10,229 $ 972 $ 33,987 $ (37,007)
Earnings (loss) per share:        
Basic $ 0.25 $ 0.08 $ 0.85 $ (3.23)
Diluted $ 0.23 $ 0.06 $ 0.77 $ (3.23)
Weighted average shares outstanding:        
Basic 40,700 12,629 39,977 11,461
Diluted 44,245 17,064 43,919 11,461