Income taxes - Income tax provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Income tax provision
State	$ 18	$ 1
Foreign	124	90
Total current tax provision	142	91
Federal	47	(20)
State	45	(30)
Foreign	(88)	(1)
Deferred Income Tax Expense (Benefit), Total	4	(51)
Income Tax Expense (Benefit), Total	$ 146	$ 40