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Fair Value Measurements (Q1) (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Fair Value Disclosures [Abstract] |  |
Schedule of Assets Measured at Fair Value on Recurring Basis | The following table sets forth by level within the fair value hierarchy the Company's financial assets that were accounted for at fair value on a recurring basis as of March 31, 2022 and December 31, 2021 (in thousands).
| ​ | ​ | March 31, 2022 | ​ | ​ | December 31, 2021
| ​ | ​ | Level 1 | ​ | ​ | Level 2 | ​ | ​ | Level 3 | ​ | ​ | Total | ​ | ​ | Level 1 | ​ | ​ | Level 2 | ​ | ​ | Level 3 | ​ | ​ | Total
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Marketable securities - available for sale | ​ | ​ | $— | ​ | ​ | $75,772 | ​ | ​ | $— | ​ | ​ | $75,772 | ​ | ​ | $— | ​ | ​ | $70,323 | ​ | ​ | $— | ​ | ​ | $70,323
| ​ | ​ | $— | ​ | ​ | $75,772 | ​ | ​ | $— | ​ | ​ | $75,772 | ​ | ​ | $— | ​ | ​ | $70,323 | ​ | ​ | $— | ​ | ​ | $70,323
| The Company's financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2021 and December 31, 2020 were as follows (in thousands):
| ​ | ​ | December 31, 2021 | ​ | ​ | December 31, 2020
| ​ | ​ | Level 1 | ​ | ​ | Level 2 | ​ | ​ | Level 3 | ​ | ​ | Total | ​ | ​ | Level 1 | ​ | ​ | Level 2 | ​ | ​ | Level 3 | ​ | ​ | Total
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
Marketable securities - available for sale | ​ | ​ | $— | ​ | ​ | $70,323 | ​ | ​ | $— | ​ | ​ | $70,323 | ​ | ​ | $— | ​ | ​ | $18,061 | ​ | ​ | $— | ​ | ​ | $18,061
| ​ | ​ | $— | ​ | ​ | $70,323 | ​ | ​ | $— | ​ | ​ | $70,323 | ​ | ​ | $— | ​ | ​ | $18,061 | ​ | ​ | $— | ​ | ​ | $18,061

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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