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Available-for-Sale-Securities (Q1) (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract] |  |
Schedule of Available-for-sale Securities Reconciliation | The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or marketable securities in our Consolidated Balance Sheets (in thousands):
| ​ | ​ | March 31, 2022 | ​ | ​ | December 31, 2021
| ​ | ​ | Cost | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value | ​ | ​ | Cost | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value
Corporate debt securities | ​ | ​ | $62,770 | ​ | ​ | $— | ​ | ​ | $(162) | ​ | ​ | $62,608 | ​ | ​ | $53,135 | ​ | ​ | $— | ​ | ​ | $(65) | ​ | ​ | $53,070
Money market funds | ​ | ​ | 6,578 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,578 | ​ | ​ | 18,124 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 18,124
Municipal debt securities | ​ | ​ | 17,267 | ​ | ​ | — | ​ | ​ | (34) | ​ | ​ | 17,233 | ​ | ​ | 20,263 | ​ | ​ | — | ​ | ​ | (5) | ​ | ​ | 20,258
Total | ​ | ​ | $86,615 | ​ | ​ | $— | ​ | ​ | $(196) | ​ | ​ | $86,419 | ​ | ​ | $91,522 | ​ | ​ | $— | ​ | ​ | $(70) | ​ | ​ | $91,452
| The following table is a summary of available-for-sale securities recorded in cash and cash equivalents or debt marketable securities in the Company's Consolidated Balance Sheets (in thousands):
| ​ | ​ | December 31, 2021 | ​ | ​ | December 31, 2020
| ​ | ​ | Cost | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value | ​ | ​ | Cost | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value
Corporate debt securities | ​ | ​ | $53,135 | ​ | ​ | $— | ​ | ​ | $(65) | ​ | ​ | $53,070 | ​ | ​ | $8,406 | ​ | ​ | $— | ​ | ​ | $(7) | ​ | ​ | $8,399
Money market funds | ​ | ​ | 18,124 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 18,124 | ​ | ​ | 7,591 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,591
Municipal debt securities | ​ | ​ | 20,263 | ​ | ​ | — | ​ | ​ | (5) | ​ | ​ | 20,258 | ​ | ​ | 14,753 | ​ | ​ | — | ​ | ​ | (6) | ​ | ​ | 14,747
Total | ​ | ​ | $91,522 | ​ | ​ | $— | ​ | ​ | $(70) | ​ | ​ | $91,452 | ​ | ​ | $30,750 | ​ | ​ | $— | ​ | ​ | $(13) | ​ | ​ | $30,737
Schedule of Marketable Securities | Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale securities in our Consolidated Balance Sheets (in thousands):
| ​ | ​ | March 31, 2022 | ​ | ​ | December 31, 2021
Cash equivalents | ​ | ​ | $10,647 | ​ | ​ | $21,129
Marketable securities | ​ | ​ | 75,772 | ​ | ​ | 70,323
Total | ​ | ​ | $86,419 | ​ | ​ | $91,452
| Estimated fair values of available-for-sale securities are generally based on prices obtained from commercial pricing services. The following table summarizes the classification of the available-for-sale debt securities on the Company's Consolidated Balance Sheets (in thousands):
| ​ | ​ | December 31, 2021 | ​ | ​ | December 31, 2020
Cash and cash equivalents | ​ | ​ | $21,129 | ​ | ​ | $12,676
Marketable securities | ​ | ​ | 70,323 | ​ | ​ | 18,061
Total | ​ | ​ | $91,452 | ​ | ​ | $30,737
Investments Classified by Contractual Maturity Date | The following table summarizes our portfolio of available-for-sale securities by contractual maturity (in thousands):
| ​ | ​ | March 31, 2022
| ​ | ​ | Amortized Cost | ​ | ​ | Estimated Fair Value
Less than one year | ​ | ​ | $86,615 | ​ | ​ | $86,419
Greater than one year | ​ | ​ |  | ​ | ​ | —
Total | ​ | ​ | $86,615 | ​ | ​ | $86,419
| The following table summarizes the Company's portfolio of available-for-sale securities by contractual maturity (in thousands):
| ​ | ​ | December 31, 2021 | ​ | ​ | December 31, 2020
| ​ | ​ | Amortized Cost | ​ | ​ | Estimated Fair Value | ​ | ​ | Amortized Cost | ​ | ​ | Estimated Fair Value
Less than one year | ​ | ​ | $91,522 | ​ | ​ | $91,452 | ​ | ​ | $30,750 | ​ | ​ | $30,737
Greater than one year | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total | ​ | ​ | $91,522 | ​ | ​ | $91,452 | ​ | ​ | $30,750 | ​ | ​ | $30,737

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