Investments and fair value measurements - Summary of Investments on Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets
Marketable securities:	$ 371,221	$ 354,436
Cash
Assets
Marketable securities:	78,200	42,300
Level 1
Assets
Total assets	157,779	146,580
Level 1 | U.S. government securities
Assets
Marketable securities:	0	0
Level 1 | Money market funds
Assets
Cash equivalents	153,725	136,771
Level 1 | Time deposits
Assets
Cash equivalents	4,054	9,809
Level 1 | U.S. government securities
Assets
Cash equivalents		0
Level 2
Assets
Total assets	135,292	165,530
Level 2 | U.S. government securities
Assets
Marketable securities:	135,292	163,844
Level 2 | Money market funds
Assets
Cash equivalents	0	0
Level 2 | Time deposits
Assets
Cash equivalents	0	0
Level 2 | U.S. government securities
Assets
Cash equivalents		1,686
Level 3
Assets
Total assets	0	0
Level 3 | U.S. government securities
Assets
Marketable securities:	0	0
Level 3 | Money market funds
Assets
Cash equivalents	0	0
Level 3 | Time deposits
Assets
Cash equivalents	$ 0	0
Level 3 | U.S. government securities
Assets
Cash equivalents		$ 0