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FAIR VALUE MEASUREMENTS, Assets and Liabilities Measured at Fair Value on Recurring Basis (Q1) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair value of reclassified levels [Abstract]      
Transfer in out of Level 3 $ 17,940,000 $ 17,940,000  
Recurring [Member] | Level 1 [Member] | Public Warrants [Member]      
Liabilities [Abstract]      
Liabilities 5,685,600 9,798,000 $ 22,364,221
Recurring [Member] | Level 3 [Member] | Private Placement Warrant [Member]      
Liabilities [Abstract]      
Liabilities 6,576,624 11,422,018 16,867,946
Recurring [Member] | Level 3 [Member] | FPA liability - Committed [Member]      
Liabilities [Abstract]      
Liabilities 2,392,629 2,474,941 2,947,167
Recurring [Member] | Level 3 [Member] | FPA liability - Optional [Member]      
Liabilities [Abstract]      
Liabilities $ 2,397,256 $ 2,533,104 $ 3,810,610