Investments in marketable securities - Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-Sale [Abstract]
Accrued investment income receivable	$ 600	$ 600		$ 600
Realized gains or losses	100	100	$ 0
Cash and Cash Equivalents
Cash and Cash Equivalents [Abstract]
Cash Equivalents, at Carrying Value	21,816	21,816		23,218
Cash Equivalents, Fair Value Disclosure	21,816	21,816		23,218
Debt Securities, Available-for-Sale [Abstract]
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	126,468	126,468		117,674
Gross Unrealized Gain	0	0		0
Gross Unrealized Loss	(1,181)	(1,181)		(1,537)
Fair Value	125,287	125,287		116,137
Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	11,160	11,160		38,129
Gross Unrealized Gain	0	0		0
Gross Unrealized Loss	(103)	(103)		(766)
Fair Value	11,057	11,057		37,363
Money market \| Cash and Cash Equivalents
Cash and Cash Equivalents [Abstract]
Money Market Funds, at Carrying Value	21,816	21,816		23,218
US treasury bills \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	7,834	7,834		8,483
Gross Unrealized Gain	0	0		0
Gross Unrealized Loss	(4)	(4)		(16)
Fair Value	7,830	7,830		8,467
US treasury bills \| Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost				25,433
Gross Unrealized Gain				0
Gross Unrealized Loss				(336)
Fair Value				25,097
US government agency bonds \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	35,624	35,624		26,686
Gross Unrealized Gain	0	0		0
Gross Unrealized Loss	(314)	(314)		(424)
Fair Value	35,310	35,310		26,262
US government agency bonds \| Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost				3,724
Gross Unrealized Gain				0
Gross Unrealized Loss				(130)
Fair Value				3,594
US corporate bonds \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	56,066	56,066		27,144
Gross Unrealized Gain	0	0		0
Gross Unrealized Loss	(507)	(507)		(303)
Fair Value	55,559	55,559		26,841
US corporate bonds \| Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	9,161	9,161
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(66)	(66)
Fair Value	9,095	9,095
Yankee bonds \| Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	1,999	1,999
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(37)	(37)
Fair Value	1,962	1,962
US government bonds \| Short Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost	26,944	26,944		55,361
Gross Unrealized Gain	0	0		0
Gross Unrealized Loss	(356)	(356)		(794)
Fair Value	$ 26,588	$ 26,588		54,567
US government bonds \| Long Term Marketable Securities
Debt Securities, Available-for-Sale [Abstract]
Amortized Cost				8,972
Gross Unrealized Gain				0
Gross Unrealized Loss				(300)
Fair Value				$ 8,672

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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