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Loss Per Share (FY) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Earnings Per Share [Abstract] |  |
Schedule of Antidilutive Securities Excluded from Computation of Loss Per Share | At March 31, 2022 and 2021, the Company excluded the following potentially dilutive securities (in thousands):
| ​ | ​ | March 31,
| ​ | ​ | 2022 | ​ | ​ | 2021
Stock Options | ​ | ​ | 2,640 | ​ | ​ | 1,022
Warrants | ​ | ​ | 21,357 | ​ | ​ | 21,357
Restricted Stock Units | ​ | ​ | 1,460 | ​ | ​ | 798
| At December 31, 2021 and 2020, the Company excluded the following potentially dilutive securities (in thousands):
| ​ | ​ | December 31,
| ​ | ​ | 2021 | ​ | ​ | 2020
Stock Options | ​ | ​ | 2,132 | ​ | ​ | 964
Warrants | ​ | ​ | 21,357 | ​ | ​ | 2,638
Restricted Stock Units | ​ | ​ | 604 | ​ | ​ | 340

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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