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Fair Value Measurements - Warrants (Q3) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Jun. 16, 2021 | Dec. 31, 2020 | Jun. 16, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Warrant liability | $ 110,350 | $ 110,350 |  |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Fair value, beginning of period | 156,187 |  |  |  |
Warrant liability acquired |  | 193,978 |  |  |
Change in valuation inputs or other assumptions | (45,837) | (83,628) |  |  |
Fair value, end of period | 110,350 | 110,350 |  |  |
Warrant liability | $ 110,350 | 110,350 |  | $ 0 |
Warrants |  |  |  |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Remaining maturity | 5 years |  |  |  |
Public Warrants |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Warrant liability |  |  |  |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Fair value, beginning of period | $ 79,375 |  |  |  |
Warrant liability acquired |  | 100,750 |  |  |
Change in valuation inputs or other assumptions | (25,375) | (46,750) |  |  |
Private Placement Warrant |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Warrant liability | 56,350 | 56,350 |  |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Fair value, beginning of period | 76,812 |  |  |  |
Warrant liability acquired |  | 93,228 |  |  |
Change in valuation inputs or other assumptions | (20,462) | (36,878) |  |  |
Fair value, end of period | 56,350 | 56,350 |  |  |
Level 1 | Public Warrants |  |  |  |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Warrant liability | 54,000 | 54,000 | $ 100,800 |  |
Level 3 | Private Placement Warrant |  |  |  |  |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Warrant liability | 56,400 | 56,400 |  |  | $ 93,200
Recurring Basis |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Warrant liability | 110,350 | 110,350 |  | 0 |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Fair value, beginning of period |  | 0 |  |  |
Fair value, end of period | 110,350 | 110,350 |  |  |
Recurring Basis | Level 1 | Public Warrants |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Warrant liability | 54,000 | 54,000 |  | 0 |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Fair value, beginning of period |  | 0 |  |  |
Fair value, end of period | 54,000 | 54,000 |  |  |
Recurring Basis | Level 3 | Private Placement Warrant |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Warrant liability | 56,350 | 56,350 |  | $ 0 |
Changes In Fair Value Of Warrant Liabilities [Roll Forward] |  |  |  |  |
Fair value, beginning of period |  | 0 |  |  |
Fair value, end of period | $ 56,350 | $ 56,350 |  |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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