Investments in marketable securities - Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	$ 47,320	$ 109,282
Investments in marketable securities, current	102,900	46,000
Investments in marketable securities, non-current	50,450	35,688
Short-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	103,925	46,099
Investments in marketable securities, Gross Unrealized Gain	5	0
Investments in marketable securities, Gross Unrealized Loss	(1,051)	(64)
Investments in marketable securities, current	102,879	46,035
Long-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	51,317	35,775
Investments in marketable securities, Gross Unrealized Gain	0	0
Investments in marketable securities, Gross Unrealized Loss	(867)	(87)
Investments in marketable securities, current	50,450	35,688
US treasury bills \| Short-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,961	37,968
Investments in marketable securities, Gross Unrealized Gain	0	0
Investments in marketable securities, Gross Unrealized Loss	(56)	(53)
Investments in marketable securities, current	8,905	37,915
US government agency bonds \| Short-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,116	8,131
Investments in marketable securities, Gross Unrealized Gain	0	0
Investments in marketable securities, Gross Unrealized Loss	(192)	(11)
Investments in marketable securities, current	18,924	8,120
US government agency bonds \| Long-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,332	13,068
Investments in marketable securities, Gross Unrealized Gain	0	0
Investments in marketable securities, Gross Unrealized Loss	(304)	(29)
Investments in marketable securities, current	12,028	13,039
US Corporate Bonds [Member] \| Short-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,499
Investments in marketable securities, Gross Unrealized Gain	5
Investments in marketable securities, Gross Unrealized Loss	(19)
Investments in marketable securities, current	6,485
US Corporate Bonds [Member] \| Long-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,135
Investments in marketable securities, Gross Unrealized Gain	0
Investments in marketable securities, Gross Unrealized Loss	(54)
Investments in marketable securities, current	12,081
US government bonds \| Short-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	69,349
Investments in marketable securities, Gross Unrealized Gain	0
Investments in marketable securities, Gross Unrealized Loss	(784)
Investments in marketable securities, current	68,565
US government bonds \| Long-term securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,850	22,707
Investments in marketable securities, Gross Unrealized Gain	0	0
Investments in marketable securities, Gross Unrealized Loss	(509)	(58)
Investments in marketable securities, current	26,341	22,649
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	23,984	62,836
Cash equivalents, Fair Value	23,984	62,836
Cash equivalents \| US government money market fund
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, Amortized Cost	23,984	62,836
Cash equivalents, Fair Value	$ 23,984	$ 62,836

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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