Fair value measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Liabilities
Contingent consideration	$ 8,604	$ 8,395	$ 10,524	$ 10,225
Recurring
Assets
Cash and cash equivalents	23,706	18,008
Investments in marketable securities, current	71,520	73,463
Total	95,226	91,471
Liabilities
Contingent consideration	8,604	8,395
Total	8,604	8,395
Recurring | Level 1
Assets
Cash and cash equivalents	23,706	18,008
Investments in marketable securities, current	0	0
Total	23,706	18,008
Liabilities
Contingent consideration	0	0
Total	0	0
Recurring | Level 2
Assets
Cash and cash equivalents	0	0
Investments in marketable securities, current	71,520	73,463
Total	71,520	73,463
Liabilities
Contingent consideration	0	0
Total	0	0
Recurring | Level 3
Assets
Cash and cash equivalents	0	0
Investments in marketable securities, current	0	0
Total	0	0
Liabilities
Contingent consideration	8,604	8,395
Total	$ 8,604	$ 8,395