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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenue $ 301,091 $ 216,113 $ 800,869 $ 516,128
Type of Revenue [Extensible List] us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Operating expenses:        
Platform operations $ 53,400 $ 44,826 $ 154,709 $ 127,167
Type of Cost, Good or Service [Extensible List] us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember us-gaap:ServiceMember
Sales and marketing $ 59,278 $ 44,637 $ 176,797 $ 116,002
Technology and development 55,847 41,079 163,301 117,931
General and administrative 52,120 42,789 155,884 117,252
Total operating expenses 220,645 173,331 650,691 478,352
Income from operations 80,446 42,782 150,178 37,776
Other expense (income):        
Interest expense (income), net 317 235 556 (740)
Foreign currency exchange loss (gain), net 1,153 (12) 1,004 1,574
Total other expense, net 1,470 223 1,560 834
Income before income taxes 78,976 42,559 148,618 36,942
Provision for (benefit from) income taxes 19,592 1,312 18,895 (53,473)
Net income $ 59,384 $ 41,247 $ 129,723 $ 90,415
Earnings per share:        
Basic $ 0.12 $ 0.09 $ 0.27 $ 0.20
Diluted $ 0.12 $ 0.08 $ 0.26 $ 0.19
Weighted average shares outstanding:        
Basic 478,101 465,819 475,496 460,747
Diluted 498,912 492,207 497,942 487,309