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Fair Value Measurements - Schedule of changes in fair value of warrant liabilities (Q1) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Fair Value Measurements (Details) - Schedule of changes in fair value of warrant liabilities [Line Items] |  |  |  |
Change in fair value of warrant liabilities |  | $ (4,358,333) | $ 348,666 | $ 2,963,666
Public [Member] |  |  |  |
Fair Value Measurements (Details) - Schedule of changes in fair value of warrant liabilities [Line Items] |  |  |  |
Fair value opening balance |  | 13,915,000 |  |
Change in fair value |  | (2,875,000) |  |
Initial measurement on March 18, 2021 |  |  |  | 11,960,000
Change in fair value of warrant liabilities |  |  |  | 1,955,000
Fair value ending balance |  | 11,040,000 |  | 13,915,000
Private Placement [Member] |  |  |  |
Fair Value Measurements (Details) - Schedule of changes in fair value of warrant liabilities [Line Items] |  |  |  |
Fair value opening balance |  | 7,238,666 |  |
Change in fair value |  | (1,483,333) |  |
Initial measurement on March 18, 2021 |  |  |  | 6,230,000
Change in fair value of warrant liabilities |  |  |  | 1,008,666
Fair value ending balance |  | 5,755,333 |  | 7,238,666
Warrant Liabilities [Member] |  |  |  |
Fair Value Measurements (Details) - Schedule of changes in fair value of warrant liabilities [Line Items] |  |  |  |
Fair value opening balance |  | 21,153,666 |  |
Change in fair value |  | (4,358,333) |  |
Initial measurement on March 18, 2021 |  |  |  | 18,190,000
Change in fair value of warrant liabilities |  |  |  | 2,963,666
Fair value ending balance |  | $ 16,795,333 |  | $ 21,153,666

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