Income taxes - Components of net income (loss) before income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Net income (loss) before income taxes
Domestic	$ (55,514)	$ (63,520)
Foreign	295	237
Loss before provision for income taxes	$ (55,219)	$ (63,283)