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Investments in marketable securities - Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Cash and Cash Equivalents [Abstract]
Cash Equivalents, at Carrying Value	$ 26,377		$ 29,533
Cash Equivalents, Fair Value Disclosure	26,377		29,533
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	75,611		86,243
Gross Unrealized Gain	25		56
Gross Unrealized Loss	(5)		(6)
Fair Value	75,631		86,293
Accrued investment income receivable	200		200
Realized gains or losses	0	$ 100
Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Fair Value	75,600		86,300
Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Fair Value	0		0
Money market
Cash and Cash Equivalents [Abstract]
Money Market Funds, at Carrying Value	23,890		29,533
US treasury bills
Cash and Cash Equivalents [Abstract]
US Government Securities, at Carrying Value	2,487
Debt Securities, Unrealized Gain (Loss)	0
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	2,487
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	56,470		55,467
Gross Unrealized Gain	3		29
Gross Unrealized Loss	(2)		0
Fair Value	56,471		55,496
US corporate bonds
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	19,141		30,776
Gross Unrealized Gain	22		27
Gross Unrealized Loss	(3)		(6)
Fair Value	$ 19,160		$ 30,797

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