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, 2026	Dec. 31, 2025
Assets:
Available-for-sale securities:	$ 89,073	$ 87,139
Assets	115,411	121,363
U.S. government securities
Assets:
Available-for-sale securities:	21,390	20,749
Corporate debt securities
Assets:
Available-for-sale securities:	56,649	51,880
Other debt securities
Assets:
Available-for-sale securities:	11,034	14,510
Convertible promissory note
Assets:
Available-for-sale securities:	2,983	2,983
Level 1
Assets:
Assets	50,430	58,690
Level 1 \| U.S. government securities
Assets:
Available-for-sale securities:	21,390	20,749
Level 1 \| Corporate debt securities
Assets:
Available-for-sale securities:	5,685	6,700
Level 1 \| Other debt securities
Assets:
Available-for-sale securities:	0	0
Level 1 \| Convertible promissory note
Assets:
Available-for-sale securities:	0	0
Level 2
Assets:
Assets	61,998	59,690
Level 2 \| U.S. government securities
Assets:
Available-for-sale securities:	0	0
Level 2 \| Corporate debt securities
Assets:
Available-for-sale securities:	50,964	45,180
Level 2 \| Other debt securities
Assets:
Available-for-sale securities:	11,034	14,510
Level 2 \| Convertible promissory note
Assets:
Available-for-sale securities:	0	0
Level 3
Assets:
Assets	2,983	2,983
Level 3 \| U.S. government securities
Assets:
Available-for-sale securities:	0	0
Level 3 \| Corporate debt securities
Assets:
Available-for-sale securities:	0	0
Level 3 \| Other debt securities
Assets:
Available-for-sale securities:	0	0
Level 3 \| Convertible promissory note
Assets:
Available-for-sale securities:	2,983	2,983
Money market accounts
Assets:
Cash equivalents:	23,355	31,241
Money market accounts \| Level 1
Assets:
Cash equivalents:	23,355	31,241
Money market accounts \| Level 2
Assets:
Cash equivalents:	0	0
Money market accounts \| Level 3
Assets:
Cash equivalents:	$ 0	$ 0