Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2025
Share-Based Payment Arrangement, Expensed and Capitalized, Amount
Stock-based compensation expense	$ 1,256	$ 20,009
Research and Development Expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount
Stock-based compensation expense	1,161	14,177
General and Administrative Expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount
Stock-based compensation expense	$ 95	$ 5,832