CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED AND COMMON STOCK AND STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Series A Convertible Preferred Stock	Series A-1 Convertible Preferred Stock	Series B Convertible Preferred Stock	Class B Convertible Common Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance, temporary equity (in shares) at Dec. 31, 2023	[1]		21,977,282	2,950,548	28,019,181	2,744,184
Beginning balance, temporary equity at Dec. 31, 2023	[1]		$ 44,621	$ 9,893	$ 82,976	$ 5,900
Convertible Preferred and Common Stock
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001 (in shares)			(21,977,282)	(2,950,548)	28,019,181	(2,744,184)
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001			$ (44,621)	$ (9,893)	$ 82,976	$ (5,900)
Ending balance, temporary equity (in shares) at Mar. 31, 2024			0	0	0	0
Ending balance, temporary equity at Mar. 31, 2024			$ 0	$ 0	$ 0	$ 0
Beginning balance, common stock (in shares) at Dec. 31, 2023	[1]						1,969,360
Beginning balance at Dec. 31, 2023	[1]	$ (92,712)					$ 10	$ 2,517	$ (95,245)	$ 6
Stockholders' Deficit
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001 (in shares)							11,260,672
Conversion of convertible preferred stock and Class B convertible common stock to common stock as a result of the Merger and reset to par of $0.00001		143,390					$ (10)	143,400
Issuance of common stock to Graphite stockholders as a result of the Merger (in shares)							8,320,485
Issuance of common stock to Graphite stockholders as a result of the Merger		116,145						116,145
Issuance of common stock at the market offerings, net of issuance costs /from private placement, net (in shares)							3,559,565
Issuance of common stock at the market offerings, net of issuance costs /from private placement, net		49,840						49,840
Reclassification of warrant liability to equity		1,918						1,918
Merger transaction costs		(5,146)						(5,146)
Exercise of stock options and common warrants (in shares)							383,898
Unrealized gain on marketable securities		(7)								(7)
Exercise of stock options		430						430
Vesting of early exercised stock options (in shares)							6,150
Vesting of early exercised stock options		10						10
Share-based compensation		947						947
Net loss		(16,648)							(16,648)
Ending balance, common stock (in shares) at Mar. 31, 2024							25,500,130
Ending balance at Mar. 31, 2024		198,167					$ 0	310,061	(111,893)	(1)
Beginning balance, temporary equity (in shares) at Dec. 31, 2023	[1]		21,977,282	2,950,548	28,019,181	2,744,184
Beginning balance, temporary equity at Dec. 31, 2023	[1]		$ 44,621	$ 9,893	$ 82,976	$ 5,900
Ending balance, temporary equity (in shares) at Sep. 30, 2024			0	0	0	0
Ending balance, temporary equity at Sep. 30, 2024			$ 0	$ 0	$ 0	$ 0
Beginning balance, common stock (in shares) at Dec. 31, 2023	[1]						1,969,360
Beginning balance at Dec. 31, 2023	[1]	(92,712)					$ 10	2,517	(95,245)	6
Stockholders' Deficit
Unrealized gain on marketable securities		517
Net loss		(37,117)
Ending balance, common stock (in shares) at Sep. 30, 2024							27,480,634
Ending balance at Sep. 30, 2024		$ 215,280					$ 0	347,119	(132,362)	523
Beginning balance, temporary equity (in shares) at Mar. 20, 2024			21,977,282	2,950,548
Stockholders' Deficit
Issuance of common stock to Graphite stockholders as a result of the Merger (in shares)		8,320,485
Issuance of common stock at the market offerings, net of issuance costs /from private placement, net (in shares)		8,670,653
Merger transaction costs		$ (5,200)
Beginning balance, temporary equity (in shares) at Mar. 31, 2024			0	0	0	0
Beginning balance, temporary equity at Mar. 31, 2024			$ 0	$ 0	$ 0	$ 0
Ending balance, temporary equity (in shares) at Jun. 30, 2024			0	0	0	0
Ending balance, temporary equity at Jun. 30, 2024			$ 0	$ 0	$ 0	$ 0
Beginning balance, common stock (in shares) at Mar. 31, 2024							25,500,130
Beginning balance at Mar. 31, 2024		198,167					$ 0	310,061	(111,893)	(1)
Stockholders' Deficit
Exercise stock options (in shares)							338,260
Exercise of stock options		3,413						3,413
Unrealized gain on marketable securities		(61)								(61)
Adjustments to reverse recapitalization accounting and issuance of common stock from private placement		31						31
Vesting of early exercised stock options (in shares)							7,281
Vesting of early exercised stock options		28						28
Share-based compensation		1,597						1,597
Net loss		(10,254)							(10,254)
Ending balance, common stock (in shares) at Jun. 30, 2024							25,845,671
Ending balance at Jun. 30, 2024		192,921					$ 0	315,130	(122,147)	(62)
Ending balance, temporary equity (in shares) at Sep. 30, 2024			0	0	0	0
Ending balance, temporary equity at Sep. 30, 2024			$ 0	$ 0	$ 0	$ 0
Stockholders' Deficit
Issuance of common stock at the market offerings, net of issuance costs /from private placement, net (in shares)							1,578,947
Issuance of common stock at the market offerings, net of issuance costs /from private placement, net		29,693						29,693
Exercise stock options (in shares)							48,736
Exercise of stock options		57						57
Unrealized gain on marketable securities		585								585
Adjustments to reverse recapitalization accounting and issuance of common stock from private placement		29						29
Vesting of early exercised stock options (in shares)							7,280
Vesting of early exercised stock options		19						19
Share-based compensation		2,191						2,191
Net loss		(10,215)							(10,215)
Ending balance, common stock (in shares) at Sep. 30, 2024							27,480,634
Ending balance at Sep. 30, 2024		$ 215,280					$ 0	347,119	(132,362)	523
Beginning balance, common stock (in shares) at Dec. 31, 2024		27,518,439					27,518,439
Beginning balance at Dec. 31, 2024		$ 204,084					$ 1	348,901	(145,014)	196
Stockholders' Deficit
Exercise stock options (in shares)							11,630
Exercise of stock options		44						44
Unrealized gain on marketable securities		(73)								(73)
Vesting of early exercised stock options (in shares)							5,594
Vesting of early exercised stock options		19						19
Share-based compensation		2,555						2,555
Net loss		(14,619)							(14,619)
Ending balance, common stock (in shares) at Mar. 31, 2025							27,535,663
Ending balance at Mar. 31, 2025		$ 192,010					$ 1	351,519	(159,633)	123
Beginning balance, common stock (in shares) at Dec. 31, 2024		27,518,439					27,518,439
Beginning balance at Dec. 31, 2024		$ 204,084					$ 1	348,901	(145,014)	196
Stockholders' Deficit
Unrealized gain on marketable securities		31
Net loss		$ (46,231)
Ending balance, common stock (in shares) at Sep. 30, 2025		28,588,261					28,588,261
Ending balance at Sep. 30, 2025		$ 193,927					$ 1	384,944	(191,245)	227
Beginning balance, common stock (in shares) at Mar. 31, 2025							27,535,663
Beginning balance at Mar. 31, 2025		192,010					$ 1	351,519	(159,633)	123
Stockholders' Deficit
Issuance of common stock at the market offerings, net of issuance costs /from private placement, net (in shares)							920,500
Issuance of common stock at the market offerings, net of issuance costs /from private placement, net		26,067						26,067
Exercise of stock warrant (in shares)							271
Issuance of common stock under employee stock purchase plan (in shares)							9,092
Issuance of common stock under employee stock purchase plan		225						225
Exercise stock options (in shares)							29,003
Exercise of stock options		196						196
Unrealized gain on marketable securities		(85)								(85)
Vesting of early exercised stock options (in shares)							5,593
Vesting of early exercised stock options		19						19
Share-based compensation		2,845						2,845
Net loss		(14,912)							(14,912)
Ending balance, common stock (in shares) at Jun. 30, 2025							28,500,122
Ending balance at Jun. 30, 2025		206,365					$ 1	380,871	(174,545)	38
Stockholders' Deficit
Exercise stock options (in shares)							86,275
Exercise of stock options		598						598
Unrealized gain on marketable securities		189								189
Vesting of early exercised stock options (in shares)							1,864
Vesting of early exercised stock options		6						6
Share-based compensation		3,469						3,469
Net loss		$ (16,700)							(16,700)
Ending balance, common stock (in shares) at Sep. 30, 2025		28,588,261					28,588,261
Ending balance at Sep. 30, 2025		$ 193,927					$ 1	$ 384,944	$ (191,245)	$ 227

[1] Retroactively recast for the reverse recapitalization as described in Note 3.