Investments in marketable securities - Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Cash and Cash Equivalents [Abstract]
Cash Equivalents, at Carrying Value	$ 14,487	$ 10,218
Cash Equivalents, Fair Value Disclosure	14,487	10,218
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	71,530	73,376
Gross Unrealized Gain	13	87
Gross Unrealized Loss	(23)	0
Fair Value	71,520	73,463
Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Fair Value	71,500	73,500
Money market funds
Cash and Cash Equivalents [Abstract]
Money Market Funds, at Carrying Value	14,487	10,218
US treasury bills
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	33,551	37,411
Gross Unrealized Gain	5	41
Gross Unrealized Loss	(11)	0
Fair Value	33,545	$ 37,452
US government bonds | Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	37,979
Gross Unrealized Gain	8
Gross Unrealized Loss	(12)
Fair Value	$ 37,975