Summary of significant accounting policies and basis of presentation - Cash, Cash Equivalents, and Marketable Securities - (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($) item
Amortized Cost
Cash and cash equivalents	$ 71,367	$ 68,802
Total money market funds and marketable securities	320,958	227,583
Fair Value
Total money market funds and marketable securities	320,679	227,663
Unrealized Gains and Losses
Marketable securities, unrealized gains	64	93
Unrealized Losses, Less than 12 months	(108)	(13)
Unrealized Losses, Greater than 12 months	(235)
Debt securities, unrealized loss position	156,300	$ 44,200
Other than temporary losses	$ 0
Number of marketable securities | item	97	14
Money market funds
Amortized Cost
Cash and cash equivalents	$ 59,658	$ 65,589
Fair Value
Cash and cash equivalents	59,658	65,589
U.S. Treasury notes
Amortized Cost
Marketable securities, amortized cost	125,996	102,966
Fair Value
Marketable securities, fair value	125,783	103,044
Unrealized Gains and Losses
Marketable securities, unrealized gains	32	81
Unrealized Losses, Less than 12 months	(45)	(3)
Unrealized Losses, Greater than 12 months	(200)
U. S. Government agency securities
Amortized Cost
Marketable securities, amortized cost	27,552	31,068
Fair Value
Marketable securities, fair value	27,518	31,075
Unrealized Gains and Losses
Marketable securities, unrealized gains	6	10
Unrealized Losses, Less than 12 months	(5)	(3)
Unrealized Losses, Greater than 12 months	(35)
Corporate bonds
Amortized Cost
Marketable securities, amortized cost	95,016	23,975
Fair Value
Marketable securities, fair value	94,976	23,970
Unrealized Gains and Losses
Marketable securities, unrealized gains	18	2
Unrealized Losses, Less than 12 months	(58)	(7)
Commercial paper
Amortized Cost
Marketable securities, amortized cost	8,456	3,985
Fair Value
Marketable securities, fair value	8,458	$ 3,985
Unrealized Gains and Losses
Marketable securities, unrealized gains	2
Certificates of deposit
Amortized Cost
Marketable securities, amortized cost	4,280
Fair Value
Marketable securities, fair value	4,286
Unrealized Gains and Losses
Marketable securities, unrealized gains	$ 6
Maximum
Unrealized Gains and Losses
Debt securities, contractual maturity period	2 years	2 years