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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenue $ 588,916 $ 454,086 $ 316,861
Cost of revenue [1] 36,300 24,811 17,609
Gross profit 552,616 429,275 299,252
Operating expenses:      
Sales and marketing 393,844 315,939 236,165
Product, technology, and development 69,462 47,866 22,470
General and administrative 50,434 39,475 22,688
Depreciation and amortization 4,554 2,804 2,655
Total operating expenses 518,294 406,084 283,978
Income from operations 34,322 23,191 15,274
Other income, net:      
Interest income 2,984 2,283 869
Other income (expense), net 1,399 10 (306)
Total other income, net 4,383 2,293 563
Income before income taxes 38,705 25,484 15,837
(Benefit from) provision for income taxes (3,441) (39,686) 2,638
Net income 42,146 65,170 13,199
Reconciliation of net income to net income attributable to common stockholders:      
Net income 42,146 65,170 13,199
Net income attributable to participating securities     (6,098)
Net income attributable to common stockholders — basic 42,146 65,170 7,101
Net income 42,146 65,170 13,199
Net income attributable to participating securities     (5,829)
Net income attributable to common stockholders — diluted $ 42,146 $ 65,170 $ 7,370
Net income per share attributable to common stockholders: (Note 11)      
Basic $ 0.38 $ 0.60 $ 0.13
Diluted $ 0.37 $ 0.57 $ 0.12
Weighted–average number of shares of common stock used in computing net income per share attributable to common stockholders:      
Basic 111,450,443 108,833,028 55,835,265
Diluted 113,431,850 113,364,712 60,637,584
[1] Includes depreciation and amortization expense for the years ended December 31, 2019, 2018, and 2017 of $3,263 $2,225, and $1,140, respectively.