CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities
Net loss	$ (14,619)	$ (16,648)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	36	5
Loss on impairment of operating right-of-use assets and related property and equipment	82	0
Accretion of discounts on marketable securities	(1,134)	(275)
Change in fair value of preferred stock warrants	0	1,047
Share-based compensation expense	2,555	947
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(996)	(518)
Accounts payable	(771)	(1,269)
Accrued liabilities	(1,202)	(7,226)
Net cash used in operating activities	(16,049)	(23,937)
Cash flows from investing activities
Purchases of marketable securities	(33,091)	0
Proceeds from maturities of marketable securities	52,090	18,000
Purchases of property and equipment	(110)	0
Net cash provided by investing activities	18,889	18,000
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	0	53,387
Cash, cash equivalents, and restricted cash acquired in connection with the Merger	0	117,824
Merger transaction costs	0	(373)
Proceeds from exercises of stock options	44	430
Net cash provided by financing activities	44	171,268
Net increase in cash, cash equivalents, and restricted cash	2,884	165,331
Cash and cash equivalents, and restricted cash, beginning of the period	20,272	35,140
Cash, cash equivalents, and restricted cash, end of the period	23,156	200,471
Supplemental cash flow information
Reclassification of warrant liability to equity	0	1,918
Prepaid expenses and other current assets assumed in the Merger	0	1,313
Accounts payable and accrued liabilities assumed in the Merger	0	2,950
Common stock issuance costs included in accounts payable and accrued expenses	0	3,547
Merger transaction costs included in accounts payable and accrued expenses	0	4,815
Right-of-use assets assumed in the Merger in exchange for operating lease liabilities	0	293
Series A, A-1, And B Convertible Preferred Stock To Common Stock
Supplemental cash flow information
Conversion of stock to common stock	0	137,490
Class B Convertible Common Stock To Common Stock
Supplemental cash flow information
Conversion of stock to common stock	$ 0	$ 5,900