v3.26.1
Risks, Liquidity, and Going Concern (Q1) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 05, 2021
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Risks, Liquidity, and Going Concern          
Accumulated deficit   $ (712,316)   $ (704,757) $ (659,235)
Sale of common stock, net of issuance costs         8,742
Net Income (Loss)   (7,559) $ (15,405) (45,522) (64,767)
Cash and cash equivalents   33,336   $ 46,303 $ 37,573
ATM Facility [Member]          
Risks, Liquidity, and Going Concern          
Remaining capacity available to be sold   $ 15,800      
ATM Facility [Member] | Maximum          
Risks, Liquidity, and Going Concern          
Sale of common stock, net of issuance costs $ 125,000