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Stock-based compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	9 Months Ended
	Jul. 16, 2026	Sep. 30, 2026	Sep. 30, 2026	Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares of common stock, outstanding, (in shares)		2,203,518	2,203,518	0
Weighted average grant date fair value (in dollars per share)		$ 19.53	$ 5.64
Unrecognized share-based compensation expense relating to share options		$ 11.0	$ 11.0
Weighted-average period for unrecognized compensation expense to be recognized			3 years 6 months
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
2025 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase shares of common stock, outstanding, (in shares)		2,002,285	2,002,285
2026 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	2,688,931
Shares increase percentage	5.00%
Shares reserved for future issuance (in shares)	100,000,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	336,116
Shares increase percentage	1.00%
Shares reserved for future issuance (in shares)	2,500,000