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Summary of Significant Accounting Policies (Q3) (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |
Schedule of Disaggregation of Revenue | The following table summarizes the Company’s disaggregated net revenue information (in thousands):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Revenues recognized over time(1) |  | $ | 50,884 |  |  | $ | 44,459 |  |  | $ | 138,969 |  |  | $ | 112,615 |
Revenues recognized at a point in time(2) |  |  | — |  |  |  | 2,046 |  |  |  | — |  |  |  | 4,855 |
Total revenues |  | $ | 50,884 |  |  | $ | 46,505 |  |  | $ | 138,969 |  |  | $ | 117,470 |
_________________
(1) | Revenues from listing subscription services, featured listings and other advertising products.
(2) | Revenues from use of orders functionality.
| The following table summarizes the Company’s disaggregated net revenue information for the years ended December 31, 2020, 2019 and 2018:
|  | 2018 |  |  | 2019 |  |  | 2020 |
Revenues recognized over time(1) |  | $ | 101,402,007 |  |  | $ | 143,489,929 |  |  | $ | 155,362,875 |
Revenues recognized at a point in time(2) |  |  | — |  |  |  | 741,550 |  |  |  | 6,427,887 |
Total revenues |  | $ | 101,402,007 |  |  | $ | 144,231,479 |  |  | $ | 161,790,762 |
(1) | Revenues from listing subscription services, featured listings and other advertising products.
(2) | Revenues from use of orders functionality.
Schedule of Revenue from External Customers by Geographic Areas | The following table summarizes the Company’s U.S. and foreign revenues (in thousands):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
U.S. revenues |  | $ | 50,884 |  |  | $ | 34,877 |  |  | $ | 138,969 |  |  | $ | 91,275 |
Foreign revenues |  |  | — |  |  |  | 11,628 |  |  |  | — |  |  |  | 26,195 |
Total revenues |  | $ | 50,884 |  |  | $ | 46,505 |  |  | $ | 138,969 |  |  | $ | 117,470 |
| The following table summarizes the Company’s U.S. and foreign revenues for the years ended December 31, 2020, 2019 and 2018:
|  | 2018 |  |  | 2019 |  |  | 2020 |
U.S. revenues |  | $ | 100,670,847 |  |  | $ | 132,076,823 |  |  | $ | 130,373,022 |
Foreign revenues |  |  | 731,160 |  |  |  | 12,154,656 |  |  |  | 31,417,740 |
Total revenues |  | $ | 101,402,007 |  |  | $ | 144,231,479 |  |  | $ | 161,790,762 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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