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Stockholders' Equity - Restricted Stock and Restricted Stock Units (FY) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Restricted Stock |  |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |
Number of shares issued (shares) | 1,061,175 | 300,450 | 612,950 | 156,184
Value of shares issued | $ 973,000 | $ 478,000 | $ 877,700 | $ 512,300
Weighted average estimated fair value | $ 0.92 | $ 1.59 | $ 1.43 | $ 3.28
Restricted Stock | Minimum |  |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |
Vesting terms (in years) | 1 year |  | 1 year |
Restricted Stock | Maximum |  |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |
Vesting terms (in years) | 4 years |  | 4 years |
Restricted Stock Units |  |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |
Number of shares issued (shares) | 1,379,860 | 458,245 | 458,245 | 325,853
Value of shares issued | $ 1,265,000 | $ 729,000 | $ 728,600 | $ 863,000.0
Weighted average estimated fair value |  |  | $ 1.59 | $ 2.65
Vesting terms (in years) | 1 year |  | 1 year |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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