Stockholders' Equity (Deficit) (Details) $ / shares in Units, $ in Thousands		6 Months Ended	12 Months Ended
	Apr. 15, 2025 shares	Jun. 30, 2026 USD ($) Vote $ / shares shares	Dec. 31, 2025 USD ($) $ / shares shares	May 01, 2026 USD ($) item	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Stockholders' Equity (Deficit)
Common stock, shares authorized (in shares)		150,000,000	150,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Common stock, shares issued (in shares)		9,381,344	9,381,344
Common stock, shares outstanding (in shares)		9,381,344	9,381,344
Number of votes per share | Vote		1
Dividend declared | $ / shares		$ 0	$ 0
Redeemable convertible preferred stock | $					$ 85,503	$ 85,503
Registration Statement on Form S-3
Stockholders' Equity (Deficit)
Maximum aggregate offering price | $				$ 200,000
Number of prospectus in registration statement | item				2
Common stock, new shares issued (in shares)		0
Original Sales Agreement Prospectus
Stockholders' Equity (Deficit)
Maximum aggregate offering price | $				$ 12,500
Tvardi Preferred Stock
Stockholders' Equity (Deficit)
Preferred stock authorized		5,000,000
Preferred stock par value | $ / shares		$ 0.001
Preferred stock shares issued		0	0
Preferred stock shares outstanding		0	0
Legacy Tvardi Preferred Stock
Stockholders' Equity (Deficit)
Number of shares of Legacy Tvardi preferred stock converted (in shares)	3,963,910
Redeemable convertible preferred stock | $		$ 0	$ 0