Registration of securities issued in business combination transactions

FAIR VALUE MEASUREMENTS - Summary of assets measured at fair value on a recurring basis (Q3) (Details)

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FAIR VALUE MEASUREMENTS - Summary of assets measured at fair value on a recurring basis (Q3) (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability $ 10,176,000 $ 13,365,500
Level 1 | Public Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability 9,890,000 12,995,000
Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable securities held in Trust Account 230,008,192 230,011,254
Level 1 | Recurring | Public Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability   12,995,000
Level 3 | Private Placement Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability $ 286,000 370,500
Level 3 | Recurring | Private Placement Warrants [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Warrant liability   $ 370,500