Fair value measurement - Schedule of the Company's Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets:
Available-for-sale securities	$ 16,401	$ 16,836
Fair Value, Recurring
Assets:
Assets	32,661	41,870
Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities	5,891	5,170
Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities	7,847	9,674
Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities	2,663	1,992
Fair Value, Recurring | Money market accounts
Assets:
Cash equivalents	16,260	25,034
Fair Value, Recurring | Level 1
Assets:
Assets	22,151	30,204
Fair Value, Recurring | Level 1 | U.S. government securities
Assets:
Available-for-sale securities	5,891	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	16,260	25,034
Fair Value, Recurring | Level 2
Assets:
Assets	10,510	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	7,847	9,674
Fair Value, Recurring | Level 2 | Other debt securities
Assets:
Available-for-sale securities	2,663	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