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v3.21.2

Stock-based Compensation - Class P Units Activity (Q3) (Details) - shares |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 16, 2021 | Sep. 30, 2021 | Jun. 15, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of Units |  |  |  |  |  |  |
Recapitalization in connection with the Business Combination (in shares) | 25,687,126 |  |  |  |  |  |
Class A-3 and Class B Units |  |  |  |  |  |  |
Number of Units |  |  |  |  |  |  |
Outstanding beginning balance (in shares) | 262,249 |  | 274,816 | 274,816 | 264,077 | 245,371 | 252,241
Repurchases (in shares) |  |  | (8,279) |  | (1,900) |  | (12,391)
Cancellations (in shares) |  |  | (4,288) |  | (1,611) | (7,284) | (38,604)
Outstanding ending balance (in shares) |  |  | 262,249 |  | 274,816 | 264,077 | 245,371
Vested (in shares) |  |  |  |  | 234,114 | 207,398 |
Class A-3 Units |  |  |  |  |  |  |
Number of Units |  |  |  |  |  |  |
Conversion to Class P Units in connection with the Business Combination (in shares) | (53,333) |  |  |  |  |  |
Class P Units |  |  |  |  |  |  |
Number of Units |  |  |  |  |  |  |
Cancellations (in shares) |  | (216,920) |  |  |  |  |
Outstanding ending balance (in shares) | 25,896,042 | 25,679,122 |  | 25,679,122 |  |  |
Vested (in shares) |  |  |  | 23,197,454 |  |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Option, Converted in Period for Business Combination + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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