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

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).

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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).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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