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Stockholders' Equity (Q1) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Equity [Abstract] |  |
Schedule of Stock Option and Warrants Activity | The following table summarizes the activity for stock options and warrants for the three months ended March 31, 2022:
| ​ | ​ | Stock Options | ​ | ​ | Warrants
| ​ | ​ | Shares | ​ | ​ | Weighted Average Exercise Price | ​ | ​ | Weighted Average Remaining Contractual Term (Years) | ​ | ​ | Aggregate Intrinsic Value (In Thousands) | ​ | ​ | Shares | ​ | ​ | Weighted Average Exercise Price | ​ | ​ | Weighted Average Remaining Contractual Term (Years) | ​ | ​ | Aggregate Intrinsic Value (In Thousands)
Outstanding at December 31, 2021 | ​ | ​ | 2,131,849 | ​ | ​ | $5.64 | ​ | ​ | 7.97 | ​ | ​ | $— | ​ | ​ | 21,356,600 | ​ | ​ | $2.84 | ​ | ​ | 4.37 | ​ | ​ | $—
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Changes during the period: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Granted | ​ | ​ | 540,600 | ​ | ​ | 0.91 | ​ | ​ |  | ​ | ​ |  | ​ | ​ | — | ​ | ​ | — | ​ | ​ |  | ​ | ​ |
Exercised | ​ | ​ | — | ​ | ​ | — | ​ | ​ |  | ​ | ​ |  | ​ | ​ | — | ​ | ​ | — | ​ | ​ |  | ​ | ​ |
Forfeited | ​ | ​ | (9,565) | ​ | ​ | 1.90 | ​ | ​ |  | ​ | ​ |  | ​ | ​ | — | ​ | ​ | — | ​ | ​ |  | ​ | ​ |
Expired | ​ | ​ | (23,275) | ​ | ​ | 26.00 | ​ | ​ |  | ​ | ​ |  | ​ | ​ | — | ​ | ​ | — | ​ | ​ |  | ​ | ​ |
Outstanding at March 31, 2022 | ​ | ​ | 2,639,609 | ​ | ​ | $4.51 | ​ | ​ | 7.83 | ​ | ​ | $— | ​ | ​ | 21,356,600 | ​ | ​ | $2.84 | ​ | ​ | 4.13 | ​ | ​ | $—
Vested at March 31, 2022 or expected to vest in the future | ​ | ​ | 2,594,630 | ​ | ​ | $4.57 | ​ | ​ | 7.80 | ​ | ​ | $— | ​ | ​ | 21,356,600 | ​ | ​ | $2.84 | ​ | ​ | 4.13 | ​ | ​ | $—
Vested at March 31, 2022 | ​ | ​ | 1,408,083 | ​ | ​ | $7.36 | ​ | ​ | 6.41 | ​ | ​ | $— | ​ | ​ | 21,356,600 | ​ | ​ | $2.84 | ​ | ​ | 4.13 | ​ | ​ | $—
| The following table summarizes the activity for stock options and warrants for the year ended December 31, 2021:
| ​ | ​ | Stock Options | ​ | ​ | Warrants
| ​ | ​ | Shares | ​ | ​ | Weighted Average Exercise Price | ​ | ​ | Weighted Average Remaining Contractual Term (Years) | ​ | ​ | Aggregate Intrinsic Value (In Thousands) | ​ | ​ | Shares | ​ | ​ | Weighted Average Exercise Price | ​ | ​ | Weighted Average Remaining Contractual Term (Years) | ​ | ​ | Aggregate Intrinsic Value (In Thousands)
Outstanding at December 31, 2020 | ​ | ​ | 963,700 | ​ | ​ | $14.64 | ​ | ​ | 5.86 | ​ | ​ | $— | ​ | ​ | 2,638,355 | ​ | ​ | $2.18 | ​ | ​ | 4.98 | ​ | ​ | $—
| ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Changes during the Year: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Granted | ​ | ​ | 1,314,790 | ​ | ​ | $1.32 | ​ | ​ |  | ​ | ​ |  | ​ | ​ | 19,519,393 | ​ | ​ | $2.90 | ​ | ​ |  | ​ | ​ |
Exercised | ​ | ​ | (7,250) | ​ | ​ | $3.28 | ​ | ​ |  | ​ | ​ | (3) | ​ | ​ | (801,148) | ​ | ​ | $2.19 | ​ | ​ |  | ​ | ​ |
Forfeited | ​ | ​ | (29,842) | ​ | ​ | $2.18 | ​ | ​ |  | ​ | ​ |  | ​ | ​ | — | ​ | ​ | $— | ​ | ​ |  | ​ | ​ |
Expired | ​ | ​ | (109,549) | ​ | ​ | $34.12 | ​ | ​ |  | ​ | ​ |  | ​ | ​ | — | ​ | ​ | $— | ​ | ​ |  | ​ | ​ |
Outstanding at December 31, 2021 | ​ | ​ | 2,131,849 | ​ | ​ | $5.64 | ​ | ​ | 7.97 | ​ | ​ | $— | ​ | ​ | 21,356,600 | ​ | ​ | $2.84 | ​ | ​ | 4.37 | ​ | ​ | $—
Vested at December 31, 2021 or expected to vest in the future | ​ | ​ | 2,120,643 | ​ | ​ | $5.66 | ​ | ​ | 7.96 | ​ | ​ | $— | ​ | ​ | 21,356,600 | ​ | ​ | $2.84 | ​ | ​ | 4.37 | ​ | ​ | $—
Exercisable at December 31, 2021 | ​ | ​ | 1,122,783 | ​ | ​ | $9.26 | ​ | ​ | 6.70 | ​ | ​ | $— | ​ | ​ | 21,356,600 | ​ | ​ | $2.84 | ​ | ​ | 4.37 | ​ | ​ | $—
Schedule of Restricted Stock Activity | During the three months ended March 31, 2022 and 2021, the Company issued restricted stock for services as follows ($ in thousands):
| ​ | ​ | Three Months Ended March 31,
| ​ | ​ | 2022 | ​ | ​ | 2021
Number of restricted stock issued | ​ | ​ | 1,061,175 | ​ | ​ | 300,450
Value of restricted stock issued | ​ | ​ | $973 | ​ | ​ | $478
| During the years ended December 31, 2021 and 2020, the Company issued restricted stock for services as follows ($ in thousands, except share data):
| ​ | ​ | 2021 | ​ | ​ | 2020
Number of Restricted Stock Issued | ​ | ​ | 612,950 | ​ | ​ | 156,184
Value of Restricted Stock Issued | ​ | ​ | $877.7 | ​ | ​ | $512.3
Schedule of Restricted Stock Units Activity | During the three months ended March 31, 2022 and 2021, the Company issued restricted stock units for services as follows ($ in thousands, except share data):
| ​ | ​ | Three Months Ended March 31,
| ​ | ​ | 2022 | ​ | ​ | 2021
Number of restricted stock units issued | ​ | ​ | 1,379,860 | ​ | ​ | 458,245
Value of restricted stock units issued | ​ | ​ | $1,265 | ​ | ​ | $729

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