Stockholder's Equity and Share-Based Compensation - Restricted Stock Units (Q1) (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Weighted average grant date fair value | |||
| Weighted average period for recognition | 2 years 7 months 6 days | 2 years 2 months 12 days | |
| Unvested restricted stock units | |||
| Number of shares | |||
| Unvested balance, Beginning | 50,000 | 7,093 | |
| Vested | (25,000) | (16,825) | |
| Unvested balance, Ending | 25,000 | 50,000 | |
| Weighted average grant date fair value | |||
| Unvested balance, Weighted average grant date fair value, Beginning | $ 11.7 | $ 10.52 | $ 44.8 |
| Vested, Weighted average grant date fair value | 11.7 | 27.92 | |
| Unvested balance, Weighted average grant date fair value, Ending | $ 11.7 | $ 10.52 | |
| Total unrecognized expense | $ 0.2 | $ 0.3 | |
| Weighted average period for recognition | 9 months 18 days |