Statements of Redeemable Convertible Preferred Stock and Stockholders’ Deficit - USD ($) $ in Thousands	Total	Series C-1 Redeemable Convertible Preferred Stock	Series D Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2023	22,701,179
Beginning balance at Dec. 31, 2023	$ 249,527
Redeemable Convertible Preferred Stock
Issuance of redeemable convertible preferred stock, net of issuance costs (in shares)		1,726,823	4,656,233
Issuance of redeemable convertible preferred stock, net of issuance costs		$ 39,886	$ 129,996
Ending balance (in shares) at Sep. 30, 2024	29,084,235
Ending balance at Sep. 30, 2024	$ 419,409
Beginning balance (in shares) at Dec. 31, 2023				10,572,061
Beginning balance at Dec. 31, 2023	(219,053)			$ 0	$ 21,578	$ (240,631)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				263,262
Issuance of common stock upon exercise of stock options	778				778
Stock-based compensation	6,055				6,055
Repurchase of common stock (in shares)				(26,750)
Repurchase of common stock	(546)				(546)
Vesting of early exercises	5				5
Net income (loss)	(30,093)					(30,093)
Ending balance (in shares) at Sep. 30, 2024				10,808,573
Ending balance at Sep. 30, 2024	(242,854)			$ 0	27,870	(270,724)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance costs	$ 474
Beginning balance (in shares) at Jun. 30, 2024	29,084,235
Beginning balance at Jun. 30, 2024	$ 419,435
Redeemable Convertible Preferred Stock
Issuance of redeemable convertible preferred stock, net of issuance costs			$ (26)
Ending balance (in shares) at Sep. 30, 2024	29,084,235
Ending balance at Sep. 30, 2024	$ 419,409
Beginning balance (in shares) at Jun. 30, 2024				10,778,769
Beginning balance at Jun. 30, 2024	(230,242)			$ 0	25,578	(255,820)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				29,804
Issuance of common stock upon exercise of stock options	142				142
Stock-based compensation	2,150				2,150
Net income (loss)	(14,904)					(14,904)
Ending balance (in shares) at Sep. 30, 2024				10,808,573
Ending balance at Sep. 30, 2024	(242,854)			$ 0	27,870	(270,724)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance costs	$ 474
Beginning balance (in shares) at Dec. 31, 2024	29,084,235	1,726,823	4,656,233
Beginning balance at Dec. 31, 2024	$ 419,409
Ending balance (in shares) at Sep. 30, 2025	29,084,235	1,726,823	4,656,233
Ending balance at Sep. 30, 2025	$ 419,409
Beginning balance (in shares) at Dec. 31, 2024	10,925,950			10,925,950
Beginning balance at Dec. 31, 2024	$ (251,656)			$ 0	30,545	(282,201)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				252,517
Issuance of common stock upon exercise of stock options	1,085				1,085
Stock-based compensation	9,581				9,581
Net income (loss)	$ 1,477					1,477
Ending balance (in shares) at Sep. 30, 2025	11,178,467			11,178,467
Ending balance at Sep. 30, 2025	$ (239,513)			$ 0	41,211	(280,724)
Beginning balance (in shares) at Jun. 30, 2025	29,084,235
Beginning balance at Jun. 30, 2025	$ 419,409
Ending balance (in shares) at Sep. 30, 2025	29,084,235	1,726,823	4,656,233
Ending balance at Sep. 30, 2025	$ 419,409
Beginning balance (in shares) at Jun. 30, 2025				11,085,044
Beginning balance at Jun. 30, 2025	(250,253)			$ 0	36,182	(286,435)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)				93,423
Issuance of common stock upon exercise of stock options	554				554
Stock-based compensation	4,475				4,475
Net income (loss)	$ 5,711					5,711
Ending balance (in shares) at Sep. 30, 2025	11,178,467			11,178,467
Ending balance at Sep. 30, 2025	$ (239,513)			$ 0	$ 41,211	$ (280,724)