CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands		Sep. 30, 2025 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares
Accounts receivable | $	[1]	$ 7,683	$ 2,152
Prepaid expenses and other current assets | $	[1]	17,196	23,791
Deferred revenue, current(2) | $	[2]	3,616	6,401
Deferred revenue, non-current | $	[2]	$ 12,430	$ 6,360
Convertible preferred stock and stockholders’ equity:
Preferred stock, shares authorized (in shares)		141,365,814
Common stock, shares authorized (in shares)		239,813,390	223,340,884
Common stock, shares issued (in shares)		37,578,571	37,040,639
Common stock, shares outstanding (in shares)		37,578,571	37,040,639
Related Party
Accounts receivable | $		$ 2,226	$ 1,473
Prepaid expenses and other current assets | $		0	9,897
Deferred revenue, current(2) | $		1,011	400
Deferred revenue, non-current | $		$ 8,545	$ 3,497
Convertible Series A preferred stock
Convertible preferred stock and stockholders’ equity:
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.00002	$ 0.00002
Preferred stock, shares issued (in shares)		56,088,617	56,088,617
Preferred stock, shares outstanding (in shares)		56,088,617	56,088,617
Preferred stock, shares authorized (in shares)		56,088,617	56,088,617
Preferred stock, liquidation preference | $		$ 640,005	$ 640,005
Series B Preferred Stock
Convertible preferred stock and stockholders’ equity:
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.00002	$ 0.00002
Preferred stock, shares issued (in shares)		25,416,180	25,416,180
Preferred stock, shares outstanding (in shares)		25,416,180	25,416,180
Preferred stock, shares authorized (in shares)		30,925,502	30,925,502
Preferred stock, liquidation preference | $		$ 505,263	$ 483,190
Series C Preferred Stock
Convertible preferred stock and stockholders’ equity:
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.00002	$ 0.00002
Preferred stock, shares issued (in shares)		26,445,232	18,060,773
Preferred stock, shares outstanding (in shares)		26,445,232	18,060,773
Preferred stock, shares authorized (in shares)		26,479,034	26,479,034
Preferred stock, liquidation preference | $		$ 494,564	$ 327,561
Series C-1 Preferred Stock
Convertible preferred stock and stockholders’ equity:
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.00002	$ 0.00002
Preferred stock, shares issued (in shares)		23,545,451	0
Preferred stock, shares outstanding (in shares)		23,545,451	0
Preferred stock, shares authorized (in shares)		27,872,661	27,872,661
Preferred stock, liquidation preference | $		$ 422,843	$ 0
Common stock, super voting
Convertible preferred stock and stockholders’ equity:
Common stock, par value (in dollars per share) | $ / shares		$ 0.00002	$ 0.00002
Common stock, shares authorized (in shares)		8,501,484	8,501,484
Common stock, shares issued (in shares)		8,501,484	8,501,484
Common stock, shares outstanding (in shares)		8,501,484	8,501,484
Common stock, excluding super voting
Convertible preferred stock and stockholders’ equity:
Common stock, par value (in dollars per share) | $ / shares		$ 0.00002	$ 0.00002
Common stock, shares authorized (in shares)		239,813,390	223,340,884
Common stock, shares issued (in shares)		37,578,571	37,040,639
Common stock, shares outstanding (in shares)		37,578,571	37,040,639

[1] Includes related party amounts of $2,226 and $1,473 (accounts receivable) and $0 and $9,897 (prepaid expenses and other current assets) as of September 30, 2025, and December 31, 2024, respectively (see Note 14).

[2] Includes related party amounts of $1,011 and $400 (deferred revenue, current) and $8,545 and $3,497 (deferred revenue, non-current) as of September 30, 2025, and December 31, 2024, respectively (see Note 14).