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Fair Value Measurements - Quantitative Information (Q3) (Details) $ in Thousands	Sep. 30, 2021 USD ($) $ / shares	Jun. 16, 2021 $ / shares	Dec. 31, 2020 USD ($)	Jun. 16, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liability | $	$ 110,350		$ 0
Level 3 | Private Placement Warrant
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liability | $	$ 56,400			$ 93,200
Level 3 | Private Placement Warrant | Exercise price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input | $ / shares	11.50	11.50
Level 3 | Private Placement Warrant | Stock price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input | $ / shares	14.50	20.55
Level 3 | Private Placement Warrant | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input	0.600	0.600
Level 3 | Private Placement Warrant | Term (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, term	4 years 8 months 15 days	5 years
Level 3 | Private Placement Warrant | Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, measurement input	0.0092	0.0089

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
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