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Net (Loss) Income Per Share - Valuation of Convertible Notes (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 15, 2025	Jun. 30, 2026	Dec. 31, 2025
Fair Value Measurements
Par value per share (in $ per share)		$ 0.001	$ 0.001
Legacy Tvardi Convertible Notes
Fair Value Measurements
Common stock at closing market trading price	1,265,757
Par value per share (in $ per share)	$ 0.001
Convertible notes outstanding		$ 0.0	$ 0.0