Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating expenses:
Research and development (including $0, $32,056, $15 and $32,115 for a related party, respectively)	$ 9,126	$ 36,020	$ 23,596	$ 41,192
General and administrative (including $71, $56, $269 and $153 for a related party, respectively)	3,615	1,829	11,755	3,407
Total operating expenses	12,741	37,849	35,351	44,599
Loss from operations	(12,741)	(37,849)	(35,351)	(44,599)
Other income (expense), net:
Change in fair value of tranche liability (including $331 for a related party for the nine months ended September 30, 2025)	0	0	365	0
Change in fair value of derivative liabilities (including $0, $549, $1,165 and $860 for a related party, respectively)	0	549	1,229	860
Interest expense (including $0, $815, $1,384 and $1,392 for a related party, respectively)	0	(815)	(1,443)	(1,392)
Loss on extinguishment and on issuance of convertible promissory notes (including $0, $0, $169 and $2,134 for a related party, respectively)	0	0	(186)	(2,134)
Other income, net	847	31	1,946	124
Total other income (expense), net	847	(235)	1,911	(2,542)
Net loss	$ (11,894)	$ (38,084)	$ (33,440)	$ (47,141)
Net loss per share attributable to common stockholders - basic	$ (0.64)	$ (28.16)	$ (2.41)	$ (35.44)
Net loss per share attributable to common stockholders - diluted	$ (0.64)	$ (28.16)	$ (2.41)	$ (35.44)
Weighted-average shares outstanding - basic	18,701,708	1,352,265	13,872,369	1,330,255
Weighted-average shares outstanding - diluted	18,701,708	1,352,265	13,872,369	1,330,255
Comprehensive loss:
Net loss	$ (11,894)	$ (38,084)	$ (33,440)	$ (47,141)
Other comprehensive income:
Unrealized gain on available-for-sale securities, net of tax	6	0	6	0
Total other comprehensive income	6	0	6	0
Comprehensive loss	$ (11,888)	$ (38,084)	$ (33,434)	$ (47,141)