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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenue $ 308,217 $ 202,926 $ 113,836
Operating expenses:      
Platform operations 66,230 39,876 22,967
Sales and marketing 61,379 46,056 26,794
Technology and development 52,806 27,313 12,819
General and administrative 58,446 32,163 13,276
Total operating expenses 238,861 145,408 75,856
Income from operations 69,356 57,518 37,980
Interest expense 1,791 3,075 1,141
Change in fair value of preferred stock warrant liabilities   9,458 5,961
Foreign currency exchange loss, net 3,940 1,151 1,023
Total other expense, net 5,731 13,684 8,125
Income before income taxes 63,625 43,834 29,855
Provision for income taxes 12,827 23,352 13,926
Net income 50,798 20,482 15,929
Net income (loss) attributable to common stockholders $ 50,798 $ (26,727) $ 8,764
Net income (loss) per share attributable to common stockholders:      
Basic $ 1.26 $ (1.46) $ 0.85
Diluted $ 1.15 $ (1.46) $ 0.39
Weighted average shares outstanding:      
Basic 40,262 18,280 10,290
Diluted 44,056 18,280 16,779