Common stock - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Common stock
Warrants outstanding	0	500,000
Exercise price		$ 10.00
Exercise of common stock warrants	373,057	0
Proceeds from warrant exercises	$ 3,731
Number of warrants expired	126,943