Cash, cash equivalents, restricted cash and available-for-sale marketable securities - Cash, cash equivalents, and marketable securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Cash and cash equivalents	$ 76,127	$ 68,802
Total money market funds and marketable securities	359,142	227,583
Debt securities, unrealized loss position	268,200	44,200
Fair Value
Total money market funds and marketable securities	358,748	227,663
Unrealized Gains and Losses
Marketable securities, unrealized gains	6	93
Marketable securities, unrealized losses	(400)	(13)
Money market funds
Amortized Cost
Cash and cash equivalents	63,854	65,589
Fair Value
Cash and cash equivalents, fair value	63,854	65,589
Certificates of deposits
Amortized Cost
Marketable securities, Amortized cost	5,447
Fair Value
Marketable securities, fair value	5,449
Unrealized Gains and Losses
Marketable securities, unrealized gains	2
U.S. Treasury notes
Amortized Cost
Marketable securities, Amortized cost	22,763	102,966
Fair Value
Marketable securities, fair value	22,714	103,044
Unrealized Gains and Losses
Marketable securities, unrealized gains		81
Marketable securities, unrealized losses	(49)	(3)
U. S. Government agency securities
Amortized Cost
Marketable securities, Amortized cost	126,820	31,068
Fair Value
Marketable securities, fair value	126,706	31,075
Unrealized Gains and Losses
Marketable securities, unrealized gains	1	10
Marketable securities, unrealized losses	(115)	(3)
Corporate bonds
Amortized Cost
Marketable securities, Amortized cost	113,885	23,975
Fair Value
Marketable securities, fair value	113,661	23,970
Unrealized Gains and Losses
Marketable securities, unrealized gains	2	2
Marketable securities, unrealized losses	(226)	(7)
Commercial paper
Amortized Cost
Marketable securities, Amortized cost	26,373	3,985
Fair Value
Marketable securities, fair value	26,364	$ 3,985
Unrealized Gains and Losses
Marketable securities, unrealized gains	1
Marketable securities, unrealized losses	$ (10)