Fair value measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets:
Available-for-sale securities	$ 40,690	$ 13,826
Fair Value, Recurring
Assets:
Assets	102,542	102,945
Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities	8,297	1,494
Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities	24,292	9,000
Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities	8,101	3,332
Fair Value, Recurring | Level 1
Assets:
Assets	72,945	91,011
Fair Value, Recurring | Level 1 | U.S. government securities
Assets:
Available-for-sale securities	8,297	1,494
Fair Value, Recurring | Level 1 | Corporate debt securities
Assets:
Available-for-sale securities	2,796	398
Fair Value, Recurring | Level 1 | Other debt securities
Assets:
Available-for-sale securities	0	0
Fair Value, Recurring | Level 2
Assets:
Assets	29,597	11,934
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	21,496	8,602
Fair Value, Recurring | Level 2 | Other debt securities
Assets:
Available-for-sale securities	8,101	3,332
Fair Value, Recurring | Money market accounts
Assets:
Cash equivalents	61,852	89,119
Fair Value, Recurring | Money market accounts | Level 1
Assets:
Cash equivalents	61,852	89,119
Fair Value, Recurring | Money market accounts | Level 2
Assets:
Cash equivalents	$ 0	$ 0