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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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