Fair value measurement - Schedule of the Company's Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Available-for-sale securities	$ 14,808	$ 16,836
Fair Value, Recurring
Assets:
Assets	29,064	41,870
Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities	4,153	5,170
Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities	7,505	9,674
Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities	3,150	1,992
Fair Value, Recurring | Money market accounts
Assets:
Cash equivalents	14,256	25,034
Fair Value, Recurring | Level 1
Assets:
Assets	18,409	30,204
Fair Value, Recurring | Level 1 | U.S. government securities
Assets:
Available-for-sale securities	4,153	5,170
Fair Value, Recurring | Level 1 | Corporate debt securities
Assets:
Available-for-sale securities	0	0
Fair Value, Recurring | Level 1 | Other debt securities
Assets:
Available-for-sale securities	0	0
Fair Value, Recurring | Level 1 | Money market accounts
Assets:
Cash equivalents	14,256	25,034
Fair Value, Recurring | Level 2
Assets:
Assets	10,655	11,666
Fair Value, Recurring | Level 2 | U.S. government securities
Assets:
Available-for-sale securities	0	0
Fair Value, Recurring | Level 2 | Corporate debt securities
Assets:
Available-for-sale securities	7,505	9,674
Fair Value, Recurring | Level 2 | Other debt securities
Assets:
Available-for-sale securities	3,150	1,992
Fair Value, Recurring | Level 2 | Money market accounts
Assets:
Cash equivalents	0	0
Fair Value, Recurring | Level 3
Assets:
Assets	0	0
Fair Value, Recurring | Level 3 | U.S. government securities
Assets:
Available-for-sale securities	0	0
Fair Value, Recurring | Level 3 | Corporate debt securities
Assets:
Available-for-sale securities	0	0
Fair Value, Recurring | Level 3 | Other debt securities
Assets:
Available-for-sale securities	0	0
Fair Value, Recurring | Level 3 | Money market accounts
Assets:
Cash equivalents	$ 0	$ 0