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FAIR VALUE MEASUREMENTS, Level 3 Fair Value Measurement Inputs (Q1) (Details)	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value Measurements [Abstract]
Expected life of the options to convert	5 years	5 years
Private Placement Warrant [Member]
Fair Value Measurements [Abstract]
Expected life of the options to convert	5 years 3 months 29 days	5 years 5 months 12 days	5 years 11 months 12 days
Private Placement Warrant [Member] | Common Stock Price [Member]
Fair Value Measurements [Abstract]
Measurement input	10.25	10.13	9.77
Private Placement Warrant [Member] | Volatility [Member]
Fair Value Measurements [Abstract]
Measurement input	0.037	0.1020	0.2259
Private Placement Warrant [Member] | Risk-Free Rate [Member]
Fair Value Measurements [Abstract]
Measurement input	0.0242	0.0130	0.0050
Private Placement Warrant [Member] | Dividend Yield [Member]
Fair Value Measurements [Abstract]
Measurement input	0	0	0
FPA liability - Committed [Member]
Fair Value Measurements [Abstract]
Expected life of the options to convert	3 months 29 days	5 months 12 days	11 months 12 days
FPA liability - Committed [Member] | Common Stock Price [Member]
Fair Value Measurements [Abstract]
Measurement input	10.25	10.13	9.77
FPA liability - Committed [Member] | Risk-Free Rate [Member]
Fair Value Measurements [Abstract]
Measurement input	0.0069	0.0017	0.0010
FPA liability - Optional [Member]
Fair Value Measurements [Abstract]
Expected life of the options to convert	3 months 29 days	5 months 12 days	11 months 12 days
FPA liability - Optional [Member] | Common Stock Price [Member]
Fair Value Measurements [Abstract]
Measurement input	10.25	10.13	9.77
FPA liability - Optional [Member] | Volatility [Member]
Fair Value Measurements [Abstract]
Measurement input	0.037	0.050	0.10
FPA liability - Optional [Member] | Risk-Free Rate [Member]
Fair Value Measurements [Abstract]
Measurement input	0.0069	0.0017	0.0010

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- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ 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 (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
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