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Stockholders' Equity - Equity Issuances (Q1) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 04, 2021
Lincoln Park Agreement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Aggregate offering amount authorized per agreement | $ 26,000,000.0 |  |  |
Commitment shares issued as consideration per agreement (in shares) | 181,510 |  |  |
Number of shares sold (in shares) | 250,000 |  |  |
Price of shares sold (in dollars per share) | $ 4.00 |  |  |
Gross price for stock transaction | $ 1,000,000 |  |  |
Term of agreement (in months) | 36 months |  |  |
Number of shares allowable to direct for Regular Purchase (in shares) | 100,000 |  |  |
Maximum obligation per directed purchase transaction for Regular Purchase | $ 2,500,000 |  |  |
Maximum shares allowed in Accelerated Purchase as percent of shares In Regular Purchase (percent) | 300.00% |  |  |
Maximum shares allowed in Accelerated Purchase as percent of shares traded during specified period (percent) | 30.00% |  |  |
Maximum beneficial ownership allowable per agreement (percent) | 9.99% |  |  |
Accelerated purchases specified floor price threshold for directed purchases |  |  | $ 1.00 |
ATM Agreement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Aggregate offering amount authorized per agreement |  |  |  | $ 50,000,000.0
Stock issued (shares) |  | 0 | 0 |

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