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Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2020 | May 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Performance obligation unsatisfied |  |  | $ 12,200 |  | $ 12,200 |
Revenue recognized |  |  | $ 13,120 | $ 8,195 | $ 9,137 | $ 9,984
All Marketplace Subscriptions |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Percentage fee reduction on marketplace subscription services |  | 50.00% |  |  |  |
United States |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Percentage fee reduction on marketplace subscription services | 20.00% |  |  |  |  |
Canada |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Percentage fee reduction on marketplace subscription services | 20.00% |  |  |  |  |
United Kingdom |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Percentage fee reduction on marketplace subscription services | 50.00% |  |  |  |  |

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 + Details
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