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Stockholders' Equity - Stock Options and Warrants (Q1) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock Options, Shares |  |  |
Options, outstanding, beginning balance (in shares) | 2,131,849 | 963,700 |
Options, Granted (in shares) | 540,600 |  |
Options, Exercised (in shares) | 0 | (7,250) |
Options, Forfeited (in shares) | (9,565) | (29,842) |
Options, Expired (in shares) | (23,275) | (109,549) |
Options, outstanding, ending balance (in shares) | 2,639,609 | 2,131,849 | 963,700
Options, Vested and expected to vest (in shares) | 2,594,630 | 2,120,643 |
Options, Vested (in shares) | 1,408,083 | 1,122,783 |
Stock Options, Weighted Average Exercise Price |  |  |
Options, outstanding. beginning balance (in dollars per share) | $ 5.64 | $ 14.64 |
Options, Granted (in dollars per share) | 0.91 | 1.32 |
Options, Exercised (in dollars per share) | 0 | 3.28 |
Options, Forfeited (in dollars per share) | 1.90 | 2.18 |
Options, Expired (in dollars per share) | 26.00 | 34.12 |
Options, outstanding, ending balance (in dollars per share) | 4.51 | 5.64 | $ 14.64
Options, Vested and expected to vest (in dollars per share) | 4.57 | 5.66 |
Options, Vested (in dollars per share) | $ 7.36 | $ 9.26 |
Stock Options, Weighted Average Contractual Term and Intrinsic Value |  |  |
Options, Outstanding, Weighted Average Remaining Contractual Term | 7 years 9 months 29 days | 7 years 11 months 19 days | 5 years 10 months 9 days
Options, Vested and expected to vest, Weighted Average Remaining Contractual Term | 7 years 9 months 18 days | 7 years 11 months 15 days |
Options, Vested, Weighted Average Remaining Contractual Term | 6 years 4 months 28 days |  |
Options, Outstanding, Aggregate Intrinsic Value | $ 0 | $ 0 | $ 0
Options, Vested and expected to vest, Aggregate Intrinsic Value | 0 | 0 |
Options, Vested, Aggregate Intrinsic Value | $ 0 | $ 0 |
Warrants, Shares |  |  |
Warrants outstanding, beginning balance (in shares) | 21,356,600 | 2,638,355 |
Warrants, Granted (in shares) | 0 | 19,519,393 |
Warrants, Exercised (in shares) | 0 | (801,148) |
Warrants, Forfeited (in shares) | 0 | 0 |
Warrants, Expired (in shares) | 0 | 0 |
Warrants outstanding, ending balance (in shares) | 21,356,600 | 21,356,600 | 2,638,355
Warrants, Vested and expected to vest (in shares) | 21,356,600 | 21,356,600 |
Warrants, Vested (in shares) | 21,356,600 | 21,356,600 |
Warrants, Weighted Average Exercise Price |  |  |
Warrants outstanding, beginning balance (in dollars per share) | $ 2.84 | $ 2.18 |
Warrants, Granted (in dollars per share) | 0 | 2.90 |
Warrants, Exercised (in dollars per share) | 0 | 2.19 |
Warrants, Forfeited (in dollars per share) | 0 | 0 |
Warrants, Expired (in dollars per share) | 0 | 0 |
Warrants outstanding, ending balance (in dollars per share) | 2.84 | 2.84 | $ 2.18
Weighted Average Exercise Price, Warrants Vested And Expected To Vest | 2.84 | 2.84 |
Warrants, Vested, Weighted Average Exercise Price (in dollars per share) | $ 2.84 | $ 2.84 |
Warrants, Weighted Average Contractual Term and Intrinsic Value |  |  |
Warrants, Outstanding, Weighted Average Remaining Contractual Term | 4 years 1 month 17 days | 4 years 4 months 13 days | 4 years 11 months 23 days
Warrants, Vested and expected to vest, Weighted Average Remaining Contractual Term | 4 years 1 month 17 days | 4 years 4 months 13 days |
Warrants, Vested, Weighted Average Remaining Contractual Term | 4 years 1 month 17 days | 4 years 4 months 13 days |
Warrants Outstanding, Aggregate Intrinsic Value | $ 0 | $ 0 | $ 0
Warrants, Vested and expected to vest, Aggregate Intrinsic Value | 0 | 0 |
Warrants, Vested, Aggregate Intrinsic Value | $ 0 | $ 0 |

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