v3.26.1
Stockholder's Equity and Share-Based Compensation - Stock Option Activity (Q1) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Number of shares        
Outstanding, Beginning of period 658,973 577,581 577,581  
Granted 191,510   248,208  
Forfeited (4,376)   (125,526)  
Outstanding, Ending of period 846,107   658,973 577,581
Vested and exercisable at March 31, 2026 387,675   357,766  
Vested or expected to vest at March 31, 2026 846,107   658,973  
Weighted average exercise price per share        
Outstanding, Beginning of period $ 44.2 $ 77.56 $ 77.56  
Granted 7.64   7.78  
Forfeited 10.99   82.56  
Outstanding, Ending of period 40.13   44.2 $ 77.56
Vested and exercisable at March 31, 2026 74.2   78.82  
Vested or expected to vest at March 31, 2026 $ 40.13   $ 44.2  
Weighted average remaining contractual term (years)        
Outstanding 7 years 6 months   7 years 1 month 6 days 7 years 6 months
Vested and exercisable at March 31, 2026 5 years 7 months 6 days   5 years 7 months 6 days  
Vested or expected to vest at March 31, 2026 7 years 6 months   7 years 1 month 6 days  
Weighted average grant date fair value of options granted $ 5.81 $ 6.2 $ 6.07 $ 20.2
Aggregate intrinsic value of options outstanding $ 0.1   $ 0.9  
Unrecognized compensation expense related to unvested stock option awards $ 3.6   $ 3.0  
Weighted average period for recognition 2 years 7 months 6 days   2 years 2 months 12 days