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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

X

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

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-Name Accounting Standards Codification
-Topic 210
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-Section 55
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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ 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 (c)(3)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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