Fair value measurement - Schedule of the Company's Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets:
Available-for-sale securities	$ 15,095	$ 16,836
Fair Value, Recurring
Assets:
Assets	28,826	41,870
Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities	2,679	5,170
Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities	9,130	9,674
Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities	3,286	1,992
Level 1 | Fair Value, Recurring
Assets:
Assets	16,805	30,204
Level 1 | Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities	2,679	5,170
Level 1 | Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities	395	0
Level 1 | Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities	0	0
Level 2 | Fair Value, Recurring
Assets:
Assets	12,021	11,666
Level 2 | Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities	0	0
Level 2 | Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities	8,735	9,674
Level 2 | Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities	3,286	1,992
Level 3 | Fair Value, Recurring
Assets:
Assets	0	0
Level 3 | Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities	0	0
Level 3 | Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities	0	0
Level 3 | Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities	0	0
Money market accounts | Fair Value, Recurring
Assets:
Cash equivalents	13,731	25,034
Money market accounts | Level 1 | Fair Value, Recurring
Assets:
Cash equivalents	13,731	25,034
Money market accounts | Level 2 | Fair Value, Recurring
Assets:
Cash equivalents	0	0
Money market accounts | Level 3 | Fair Value, Recurring
Assets:
Cash equivalents	$ 0	$ 0