Equity investment securities - Schedule of Securities (Details) $ in Thousands		12 Months Ended
	Jun. 04, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Equity investment securities, current		$ 776	$ 454
Equity investment securities, non-current		$ 0	151
Gross proceeds from sale	$ 3,600
Cash proceeds from sale	1,500
Common shares in publicly traded gold mining company	$ 2,100
Equity securities, FV-NI, restricted period (in years)		1 year
Securities available for sale, percent		0.25
Fair Value, Inputs, Level 1
Debt and Equity Securities, FV-NI [Line Items]
Equity investment securities, current		$ 776	454
Equity investment securities, non-current		0	151
Total		$ 776	$ 605