Subsequent events (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Subsequent events
Proceeds from issuance of common stock		$ 20,000	$ 34
Subsequent events | Public offering
Subsequent events
Issuance of common stock (in shares)	22,258,064
Price per share	$ 7.75
Proceeds from issuance of common stock	$ 172,500