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Summary of Significant Accounting Policies (Q1) (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 04, 2026 USD ($) | Jul. 14, 2025 shares | Mar. 31, 2026 USD ($) shares | Mar. 31, 2025 USD ($) shares | Dec. 31, 2025 USD ($) shares | Dec. 31, 2024 USD ($) shares
Summary of Significant Accounting Policies |  |  |  |  |  |
Stock split |  | 0.05 |  |  |  |
Stock issued during period, Reverse stock splits | shares |  | 0 |  |  |  |
Cash and cash equivalents |  |  | $ 33,336 |  | $ 46,303 | $ 37,573
Marketable securities |  |  | 0 |  | 0 | 39,183
Impairment of property and equipment |  |  |  |  | 3,500 |
Impairment expenses for right of use assets |  |  | 0 | $ 0 | 2,633 | 2,516
Other income (expense), net |  |  | 688 | 1,054 | 3,774 | 5,633
Amortization of premium and discount |  |  | 300 | 700 | 2,300 | 4,300
Sublease Income |  |  | $ 356 | $ 367 | $ 1,467 | $ 987
Amount of antidilutive securities excluded from computation of earnings per share | shares |  |  | 872,700 | 768,047 | 709,669 | 587,310
Loss on disposal of property and equipment | $ 3,200 |  |  |  |  | $ 0
Stock options |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Amount of antidilutive securities excluded from computation of earnings per share | shares |  |  | 846,107 | 704,699 | 658,973 | 577,581
Unvested restricted stock units |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Amount of antidilutive securities excluded from computation of earnings per share | shares |  |  | 25,000 | 62,500 | 50,000 | 7,093
Employee stock purchase plan |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Amount of antidilutive securities excluded from computation of earnings per share | shares |  |  | 1,593 | 848 | 696 | 2,636
Computer hardware |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Useful life |  |  | 3 years |  | 3 years |
Office equipment |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Useful life |  |  | 5 years |  | 5 years |
Laboratory equipment |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Useful life |  |  | 5 years |  | 5 years |
Impairment of property and equipment |  |  |  |  | $ 2,500 |
Furniture and fixtures |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Useful life |  |  | 7 years |  | 7 years |
Laboratory equipment and certain other assets |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |
Impairment of property and equipment |  |  |  | $ 2,600 |  |

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