Cash, cash equivalents, restricted cash and available-for-sale marketable securities - Cash, cash equivalents, and marketable securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Amortized Cost
Cash and cash equivalents	$ 143,078	$ 68,802	$ 268,321
Total money market funds and marketable securities	306,305	227,583
Debt securities, unrealized loss position	230,700	44,200
Marketable securities, non-current	980
Fair Value
Total money market funds and marketable securities	305,934	227,663
Unrealized Gains and Losses
Total money market funds and marketable securities	19	93
Total money market funds and marketable securities	(390)	(13)
Money market funds
Amortized Cost
Cash and cash equivalents	49,444	65,589
Fair Value
Cash and cash equivalents, fair value	49,444	65,589
U.S. Treasury notes
Amortized Cost
Marketable securities, amortized cost	24,540	102,966
Fair Value
Marketable securities, fair value	24,486	103,044
Unrealized Gains and Losses
Marketable securities, unrealized gains		81
Marketable securities, unrealized losses	(54)	(3)
U. S. Government agency securities
Amortized Cost
Marketable securities, amortized cost	138,285	31,068
Fair Value
Marketable securities, fair value	138,191	31,075
Unrealized Gains and Losses
Marketable securities, unrealized gains	7	10
Marketable securities, unrealized losses	(101)	(3)
Corporate bonds
Amortized Cost
Marketable securities, amortized cost	89,207	23,975
Fair Value
Marketable securities, fair value	88,983	23,970
Unrealized Gains and Losses
Marketable securities, unrealized gains	11	2
Marketable securities, unrealized losses	(235)	(7)
Commercial paper
Amortized Cost
Marketable securities, amortized cost	4,829	3,985
Fair Value
Marketable securities, fair value	4,830	$ 3,985
Unrealized Gains and Losses
Marketable securities, unrealized gains	$ 1