Common stock - Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended	29 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025	Sep. 30, 2026	May 14, 2024
Common Stock [Line Items]
Proceeds from issuance of common stock	$ 0	$ 45,897
Open Market Sale
Common Stock [Line Items]
Shares issued	0			6,655,587
Offering price of shares					$ 200,000
Percentage of commission					0.003%
Gross proceeds from issuance of common shares				$ 65,900
Proceeds from issuance of common stock				64,500
Value of shares available for future issuance	$ 134,100			$ 134,100
Public offering
Common Stock [Line Items]
Shares issued	22,258,064		21,418,750
Shares Issued, Price Per Share	$ 7.75		$ 21.5	$ 7.75
Proceeds from issuance of common stock	$ 161,700		$ 432,400