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Warrant Liability (Q3) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 16, 2021 | Jun. 07, 2019 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 16, 2021
Derivative [Line Items] |  |  |  |  |  |  |  |
Unit price (in dollars per share) |  | $ 11.50 |  |  |  |  |  |
Notice period to redeem warrants | 30 days |  |  |  |  |  |  |
Threshold trading days | 20 days |  |  |  |  |  |  |
Trading period | 30 days |  |  |  |  |  |  |
Change in fair value of warrant liability |  |  | $ 45,837 | $ 83,600 | $ 0 | $ 83,628 | $ 0 |
Common Stock |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Stock price trigger (in dollars per share) | $ 18.00 |  |  |  |  |  |  |
Public Warrants |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  | 12,499,933 | 12,499,933 |  | 12,499,933 |  |
Units issued (in shares) |  | 12,500,000 |  |  |  |  |  |
Warrant redemption price (in dollars per share) | $ 0.01 |  |  |  |  |  |  |
Private Placement Warrant |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  | 7,000,000 | 7,000,000 |  | 7,000,000 |  | 7,000,000
Number of ordinary shares called by each warrant (in shares) |  |  | 1 | 1 |  | 1 |  |
Warrants issued (in shares) |  |  | 7,000,000 |  |  |  |  |
Limitation period to transfer, assign or sell warrants |  |  | 30 days |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of ordinary shares called by each warrant (in shares) |  | 1 |  |  |  |  |  |
Exercise price of warrant (in dollars per share) |  |  | $ 11.50 | $ 11.50 |  | $ 11.50 |  |

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