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Accrued Liabilities (FY) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Accrued Liabilities [Abstract] |  |
Schedule of Accrued Liabilities | Accrued liabilities as of March 31, 2022 and December 31, 2021 were as follows (in thousands):
| ​ | ​ | March 31, 2022 | ​ | ​ | December 31, 2021
Salaries, employee benefits and related taxes | ​ | ​ | $1,005 | ​ | ​ | $2,034
Operating lease liabilities — current | ​ | ​ | 205 | ​ | ​ | 229
Other | ​ | ​ | 894 | ​ | ​ | 326
Total | ​ | ​ | $2,104 | ​ | ​ | $2,589
| Accrued liabilities were as follow (in thousands):
| ​ | ​ | December 31,
| ​ | ​ | 2021 | ​ | ​ | 2020
Salaries, employee benefits and related taxes | ​ | ​ | $2,034 | ​ | ​ | $1,716
Operating lease liabilities - current | ​ | ​ | 229 | ​ | ​ | 370
Other | ​ | ​ | 326 | ​ | ​ | 400
| ​ | ​ | $2,589 | ​ | ​ | $2,486

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