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Risks and Liquidity (FY) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 05, 2021 | Mar. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2026
Risks And Liquidity [Line Items] |  |  |  |  |
Accumulated deficit |  |  | $ (704,757) | $ (659,235) | $ (712,316)
Sale of common stock, net of issuance costs |  |  |  | $ 8,742 |
ATM Facility |  |  |  |  |
Risks And Liquidity [Line Items] |  |  |  |  |
Shares issued |  |  | 300,000 |  |
Proceeds from issuance of common stock, net of offering costs |  | $ 8,700 |  |  |
Issuance cost |  | $ 300 |  |  |
ATM Facility | Maximum |  |  |  |  |
Risks And Liquidity [Line Items] |  |  |  |  |
Sale of common stock, net of issuance costs | $ 125,000 |  |  |  |

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