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Summary of Significant Accounting Policies - Summary of Changes on Consolidated Statement of Operations as a Result of Adoption of ASC 606 (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]                      
Revenue $ 158,153 $ 150,462 $ 145,031 $ 135,270 $ 126,090 $ 119,125 $ 110,296 $ 98,575 $ 588,916 $ 454,086 $ 316,861
Cost of revenue 10,560 9,392 8,628 7,720 6,871 6,412 5,959 5,569 36,300 [1] 24,811 [1] 17,609 [1]
Gross profit 147,593 141,070 136,403 127,550 119,219 112,713 104,337 93,006 552,616 429,275 299,252
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 13,635 9,704 3,548 7,435 6,902 5,877 3,953 6,459 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 $ 13,171 $ 10,384 $ 6,007 $ 12,584 $ 12,450 $ 13,882 $ 33,343 $ 5,495 $ 42,146 $ 65,170 $ 13,199
Basic $ 0.12 [2] $ 0.09 [2] $ 0.05 [2] $ 0.11 [2] $ 0.11 [2] $ 0.13 [2] $ 0.31 [2] $ 0.05 [2] $ 0.38 $ 0.60 $ 0.13
Diluted $ 0.12 [2] $ 0.09 [2] $ 0.05 [2] $ 0.11 [2] $ 0.11 [2] $ 0.12 [2] $ 0.29 [2] $ 0.05 [2] $ 0.37 $ 0.57 $ 0.12
Marketplace Subscription Revenue                      
Summary Of Significant Accounting Policies [Line Items]                      
Revenue                 $ 526,043 $ 405,780 $ 282,664
Adjustments | ASC 606                      
Summary Of Significant Accounting Policies [Line Items]                      
Revenue                   126  
Operating expenses:                      
Sales and marketing                   (9,298)  
Other income, net:                      
Income before income taxes                   9,424  
(Benefit from) provision for income taxes                   $ 2,436  
Basic                   $ 0.07  
Diluted                   $ 0.06  
Adjustments | ASC 606 | Costs To Obtain a Contract                      
Operating expenses:                      
Sales and marketing                   $ (9,298)  
Total operating expenses                   (9,298)  
Income from operations                   9,298  
Other income, net:                      
Income before income taxes                   9,298  
(Benefit from) provision for income taxes                   2,399  
Net income                   $ 6,899  
Basic                   $ 0.07  
Diluted                   $ 0.06  
Adjustments | ASC 606 | Marketplace Subscription Revenue                      
Summary Of Significant Accounting Policies [Line Items]                      
Revenue                   $ 126  
Gross profit                   126  
Operating expenses:                      
Income from operations                   126  
Other income, net:                      
Income before income taxes                   126  
(Benefit from) provision for income taxes                   37  
Net income                   89  
Pro Forma as if the Previous Accounting Guidance was in Effect | ASC 606                      
Summary Of Significant Accounting Policies [Line Items]                      
Revenue                   453,960  
Cost of revenue                   24,811  
Gross profit                   429,149  
Operating expenses:                      
Sales and marketing                   325,237  
Product, technology, and development                   47,866  
General and administrative                   39,475  
Depreciation and amortization                   2,804  
Total operating expenses                   415,382  
Income from operations                   13,767  
Other income, net:                      
Interest income                   2,283  
Other income (expense), net                   10  
Total other income, net                   2,293  
Income before income taxes                   16,060  
(Benefit from) provision for income taxes                   (42,122)  
Net income                   $ 58,182  
Basic                   $ 0.53  
Diluted                   $ 0.51  
[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.
[2] The amounts were computed independently for each quarter, and the sum of the quarters may not total the annual amounts.