Investments in marketable securities - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) numberOfSegments	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) numberOfSegments
Marketable Securities [Line Items]
Fair Value	$ 71,520		$ 73,463
Debt securities, available-for-sale, unrealized loss Position, number of positions | numberOfSegments	22		0
Accrued investment income receivable	$ 300		$ 300
Realized gains or losses	0	$ 0
Short Term Marketable Securities
Marketable Securities [Line Items]
Fair Value	71,500		73,500
Long Term Marketable Securities
Marketable Securities [Line Items]
Fair Value	$ 0		$ 0