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Available-for-Sale-Securities - Schedule of Available-for-Sale Securities Reconciliation (Q1) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | $ 86,615 | $ 91,522 | $ 30,750
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | (196) | (70) | (13)
Estimated Fair Value | 86,419 | 91,452 | 30,737
Corporate debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 62,770 | 53,135 | 8,406
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | (162) | (65) | (7)
Estimated Fair Value | 62,608 | 53,070 | 8,399
Money market funds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 6,578 | 18,124 | 7,591
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | 0 | 0 | 0
Estimated Fair Value | 6,578 | 18,124 | 7,591
Municipal debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost | 17,267 | 20,263 | 14,753
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | (34) | (5) | (6)
Estimated Fair Value | $ 17,233 | $ 20,258 | $ 14,747

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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