Investments and fair value measurements - Summary of Investments on Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Marketable securities	$ 479,440	$ 465,372
Strategic investments	10,311	12,104
Level 1
Assets
Cash equivalents	267,036	130,377
Strategic investments	0	0
Non-current liabilities:
Cash settled stock appreciation rights	0	0
Level 1 | U.S. government securities
Assets
Cash equivalents	0	0
Marketable securities	0	0
Level 1 | Money market funds
Assets
Cash equivalents	267,036	130,377
Level 2
Assets
Cash equivalents	14,881	48,900
Strategic investments	0	0
Non-current liabilities:
Cash settled stock appreciation rights	0	0
Level 2 | U.S. government securities
Assets
Cash equivalents	14,881	48,900
Marketable securities	151,466	151,687
Level 2 | Money market funds
Assets
Cash equivalents	0	0
Level 3
Assets
Cash equivalents	0	0
Strategic investments	10,311	12,104
Non-current liabilities:
Cash settled stock appreciation rights	26	462
Level 3 | U.S. government securities
Assets
Cash equivalents	0	0
Marketable securities	0	0
Level 3 | Money market funds
Assets
Cash equivalents	$ 0	$ 0