Common Stock - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended					3 Months Ended		9 Months Ended
	Jun. 30, 2025 $ / shares shares	Jul. 31, 2024 $ / shares shares	Jun. 30, 2024 $ / shares shares	Feb. 29, 2024 USD ($) $ / shares shares	Dec. 31, 2018	Sep. 30, 2025 USD ($) vote $ / shares shares	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) vote $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 $ / shares shares
Class of Stock [Line Items]
Common stock, authorized (in shares)						51,100,000		51,100,000		51,100,000
Common stock, par value (in dollars per share) | $ / shares						$ 0.00001		$ 0.00001		$ 0.00001
Common stock, outstanding (in shares)						11,178,467		11,178,467		10,925,950
Number of votes per share of common stock | vote						1		1
Total unrecognized compensation cost | $						$ 60,700		$ 60,700
Granted (in shares)								2,721,201
Granted (in dollars per share) | $ / shares								$ 20.17
Shares repurchased in period (in shares)		22,302	52,750
Repurchase price (in dollars per share) | $ / shares		$ 22.42	$ 22.42
Stock-based compensation expense related to the sale of stock | $							$ 100		$ 400
Total stock-based compensation | $						$ 4,475	$ 2,150	$ 9,581	6,055
Employee Stock Option
Class of Stock [Line Items]
Recognition period for unrecognized compensation cost								3 years 9 months 18 days
Vesting period	6 years
The 2018 Plan
Class of Stock [Line Items]
Expiration period					10 years
Purchase price of common stock, percent of market price					100.00%
Common stock authorized (in shares)						12,409,025		12,409,025		10,904,372
The 2018 Plan | Share-Based Payment Arrangement, Tranche One
Class of Stock [Line Items]
Vesting percentage					25.00%
Vesting period								1 year
The 2018 Plan | Share-Based Payment Arrangement, Tranche Two
Class of Stock [Line Items]
Vesting percentage					75.00%
Vesting period								36 months
Chief Executive Officer And Co-Founder
Class of Stock [Line Items]
Granted (in shares)	1,003,102
Chief Technology Officer And Co-Founder
Class of Stock [Line Items]
Granted (in shares)	501,551
Related Party
Class of Stock [Line Items]
Granted (in dollars per share) | $ / shares	$ 20.04
Shares repurchased in period (in shares)				26,750
Repurchase price (in dollars per share) | $ / shares				$ 20.3950
Shares repurchased (in shares)				26,750
Value of shares repurchased | $				$ 500
Total stock-based compensation | $									$ 200