Consolidated statements of cash flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities:
Net loss		$ (62,806)	$ (20,537)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense		89	60
Stock-based compensation expense		6,004	3,325
Change in fair value of preferred stock tranche right liabilities		(2,859)	(15,527)
Series B issuance costs allocated to tranche right liability			134
Net amortization of premiums and accretion of discounts on short-term investments		(1,655)	(1,260)
Non-cash lease expense		182	82
Changes in operating assets and liabilities:
Accounts receivable - related party		(515)	314
Prepaid expenses and other assets		(1,008)	(6,237)
Accounts payable		2,017	1,278
Accrued expenses and other current liabilities		1,512	422
Operating lease liabilities		(133)	(82)
Net cash used in operating activities		(59,172)	(37,926)
Cash flows from investing activities:
Purchases of short-term investments		(290,609)	(128,990)
Maturities of short-term investments		231,635	46,292
Purchases of property and equipment		(511)	(144)
Net cash used in investing activities		(59,485)	(82,842)
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriters discounts and commissions		272,723
Proceeds from exercises of stock options		159	118
Payments of initial public offering costs		(3,896)
Net cash provided by financing activities		418,910	129,550
Net increase in cash, cash equivalents and restricted cash		300,253	8,782
Cash, cash equivalents and restricted cash at beginning of period		25,833	17,051
Cash, cash equivalents and restricted cash at end of period		326,086	25,833
Cash, cash equivalents and restricted cash at end of period:
Cash and cash equivalents		325,892	25,833
Restricted cash		194
Total cash, cash equivalents and restricted cash at end of period		326,086	25,833
Supplemental cash flow information:
Right-of-use asset obtained in exchange for operating lease liability		1,922	36
Supplemental disclosure of non-cash investing and financing activities:
Initial public offering costs included in accounts payable		34
Related Party
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense			102
Series A Redeemable Convertible Preferred Stock
Cash flows from financing activities:
Proceeds from the issuance of preferred stock	[1]		80,000
Series A Redeemable Convertible Preferred Stock | Related Party
Cash flows from financing activities:
Proceeds from the issuance of preferred stock			10,000
Series B Redeemable Convertible Preferred Stock
Cash flows from financing activities:
Proceeds from the issuance of preferred stock		149,924	49,432
Series A Preferred Stock
Supplemental disclosure of non-cash investing and financing activities:
Settlement of preferred stock tranche right liability			$ 320
Series B Preferred Stock
Supplemental disclosure of non-cash investing and financing activities:
Settlement of preferred stock tranche right liability		$ 15

[1] Includes related party amount of $10.0 million for the year ended December 31, 2023 (Note 16).