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Subsequent Events (Q1) (Details) - USD ($) $ / shares in Units, $ in Thousands | Apr. 26, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Subsequent Event [Line Items] |  |  |  |
Preferred stock, par value (in usd per share) |  | $ 0.01 | $ 0.01 | $ 0.01
Subsequent event | Merger Agreement | Cend |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Expected post-merger ownership in Company by Cend stockholders (percent) | 50.00% |  |  |
Expected post-merger ownership in Company by Company stockholders (percent) | 50.00% |  |  |
Transaction expenses threshold for allocation | $ 250 |  |  |
Minimum net cash threshold at closing per agreement | 64,900 |  |  |
Potential termination fee payable | 1,000 |  |  |
Potential termination fee receivable | 4,000 |  |  |
Potential expense reimbursement per agreement | $ 1,000 |  |  |
Subsequent event | Cend Purchase Agreement |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Series D original issue price (in usd per share) | $ 8.8057 |  |  |
Aggregate price | $ 10,000 |  |  |
Pre-Equity Offering Value After Conversion | $ 250,000 |  |  |
Subsequent event | Cend Purchase Agreement | Cend Series D preferred stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of shares purchased | 1,135,628 |  |  |
Preferred stock, par value (in usd per share) | $ 0.00001 |  |  |
Subsequent event | Cend Purchase Agreement | Cend |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Potential gross proceeds | $ 50,000 |  |  |

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