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Share-Based Compensation (FY) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |  |
Schedule of Share-Based Compensation Expense | The following table summarizes the components of share-based compensation expense for the three months ended March 31, 2022 and 2021 (in thousands):
| ​ | ​ | Three Months Ended March 31,
| ​ | ​ | 2022 | ​ | ​ | 2021
Research and development | ​ | ​ | $218 | ​ | ​ | $96
General and administrative | ​ | ​ | 542 | ​ | ​ | 501
Total share-based compensation expense | ​ | ​ | $760 | ​ | ​ | $597
| The following table summarizes the components of share-based compensation expense for the years ended December 31, 2021 and 2020 ($ in thousands):
| ​ | ​ | Year Ended December 31,
| ​ | ​ | 2021 | ​ | ​ | 2020
Research and development | ​ | ​ | $760 | ​ | ​ | $179
General and administrative | ​ | ​ | 1,245 | ​ | ​ | 1,086
Total share-based compensation expense | ​ | ​ | $2,005 | ​ | ​ | $1,265
Total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards are expected to be recognized at December 31, 2021 were as follows ($ in thousands):
| ​ | ​ | Stock Options | ​ | ​ | Restricted Stock Units | ​ | ​ | Restricted Stock
Unrecognized compensation cost | ​ | ​ | $757 | ​ | ​ | $149 | ​ | ​ | $546
Expected weighted-average period in years of compensation cost to be recognized | ​ | ​ | 1.64 | ​ | ​ | 1.57 | ​ | ​ | 1.70
Schedule of Fair Value of Shares Vested and Weighted Average Estimated Fair Values of Shares Granted |  | Total fair value of shares vested and the weighted average estimated fair values of shares granted for the years ended December 31, 2021 and 2020 were as follows ($ in thousands):
| ​ | ​ | Stock Options
| ​ | ​ | Year Ended December 31,
| ​ | ​ | 2021 | ​ | ​ | 2020
Total fair value of shares vested | ​ | ​ | $757 | ​ | ​ | $536
Weighted average estimated fair value of shares granted | ​ | ​ | 0.91 | ​ | ​ | 2.11
Schedule of Assumptions in Calculating Fair Values of Stock Options | Total fair value of shares vested and the weighted average estimated fair values of shares granted for the three months ended March 31, 2022 and 2021 were as follows (in thousands):
| ​ | ​ | Stock Options
| ​ | ​ | Three Months Ended March 31,
| ​ | ​ | 2022 | ​ | ​ | 2021
Total fair value of shares vested | ​ | ​ | $377 | ​ | ​ | $397
Weighted average estimated fair value of shares granted | ​ | ​ | $0.62 | ​ | ​ | $1.08
| The range of assumptions made in calculating the fair values of stock options was as follow:
| ​ | ​ | Stock Options
| ​ | ​ | Year Ended December 31,
| ​ | ​ | 2021 | ​ | ​ | 2020
Expected term - minimum (in years) | ​ | ​ | 6 | ​ | ​ | 6
Expected term - maximum (in years) | ​ | ​ | 6 | ​ | ​ | 6
Expected volatility - minimum | ​ | ​ | 79% | ​ | ​ | 75%
Expected volatility - maximum | ​ | ​ | 84% | ​ | ​ | 79%
Weighted Average volatility | ​ | ​ | 81% | ​ | ​ | 75%
Expected dividend yield | ​ | ​ | — | ​ | ​ | —
Risk-free interest rate - minimum | ​ | ​ | 0.63% | ​ | ​ | 0.40%
Risk-free interest rate - maximum | ​ | ​ | 1.16% | ​ | ​ | 1.71%

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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