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Share-Based Compensation - Share-Based Compensation Expense (Q1) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense $ 760 $ 597 $ 2,005 $ 1,265
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense 218 96 760 179
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation expense $ 542 $ 501 $ 1,245 $ 1,086