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Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers by Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Revenue by Revenue Stream [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 158,153 | $ 150,462 | $ 145,031 | $ 135,270 | $ 126,090 | $ 119,125 | $ 110,296 | $ 98,575 | $ 588,916 | $ 454,086 | $ 316,861
Marketplace Subscription Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue by Revenue Stream [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 526,043 | 405,780 | 282,664
Advertising and Other Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue by Revenue Stream [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 62,873 | $ 48,306 | $ 34,197

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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