v3.25.1
Stock Based Compensation - Summary of Company's Stock Option Activity (Q1) (Details) - Employee Stock Option - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Beginning balance (shares) 48 33 13  
Granted, number of options 0 24 24  
Ending balance (shares) 48 48 33 13
Outstanding and Vested,ending balance (shares) 48      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]        
Beginning balance (USD per share) $ 2.68 $ 14.84 $ 47.53  
Exercise price 0 2.03 3.32  
Ending balance (USD per share) 2.68 $ 2.68 $ 14.84 $ 47.53
Outstanding and Vested, ending balance (USD per share) $ 2.68      
Additional disclosures        
Outstanding - weighted average remaining contractual term 8 years 3 months 18 days 8 years 6 months    
Outstanding and vested - weighted average remaining contractual term 8 years 3 months 18 days 8 years 6 months 6 years 10 months 24 days 1 year 7 months 6 days
Outstanding, aggregate intrinsic value $ 17,900 $ 0    
Outstanding and vested, aggregate intrinsic value $ 17,900 $ 0 $ 0 $ 0