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Unaudited Condensed Consolidated Income Statements - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Revenue $ 150,462 $ 119,125 $ 430,763 $ 327,996
Cost of revenue [1] 9,392 6,412 25,740 17,940
Gross profit 141,070 112,713 405,023 310,056
Operating expenses:        
Sales and marketing 100,133 82,708 293,238 229,948
Product, technology, and development 17,745 12,771 51,063 33,713
General and administrative 12,322 10,630 36,622 28,042
Depreciation and amortization 1,166 727 3,413 2,064
Total operating expenses 131,366 106,836 384,336 293,767
Income from operations 9,704 5,877 20,687 16,289
Other income, net:        
Interest income 759 639 2,247 1,571
Other income (expense), net 251 (38) 1,258 15
Total other income, net 1,010 601 3,505 1,586
Income before income taxes 10,714 6,478 24,192 17,875
Provision for (benefit from) income taxes 330 (7,404) (4,783) (34,845)
Net income $ 10,384 $ 13,882 $ 28,975 $ 52,720
Net income per share attributable to common stockholders: (Note 10)        
Basic $ 0.09 $ 0.13 $ 0.26 $ 0.49
Diluted $ 0.09 $ 0.12 $ 0.26 $ 0.47
Weighted-average number of shares of common stock used in computing net income per share attributable to common stockholders:        
Basic 111,662,949 109,628,692 111,257,271 108,367,270
Diluted 113,364,775 113,601,415 113,389,695 113,351,150
[1] Includes depreciation and amortization expense for the three months ended September 30, 2019 and 2018 and for the nine months ended September 30, 2019 and 2018 of $952, $581, $2,246 and $1,701, respectively.