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Fair value measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets:
Available-for-sale securities:	$ 68,335	$ 13,826
Fair Value, Recurring
Assets:
Assets	94,636	102,945
Fair Value, Recurring | U.S. government securities
Assets:
Available-for-sale securities:	16,620	1,494
Fair Value, Recurring | Corporate debt securities
Assets:
Available-for-sale securities:	39,221	9,000
Fair Value, Recurring | Other debt securities
Assets:
Available-for-sale securities:	12,494	3,332
Fair Value, Recurring | Level 1
Assets:
Assets	45,717	91,011
Fair Value, Recurring | Level 1 | U.S. government securities
Assets:
Available-for-sale securities:	16,620	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	48,919	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:	36,425	8,602
Fair Value, Recurring | Level 2 | Other debt securities
Assets:
Available-for-sale securities:	12,494	3,332
Fair Value, Recurring | Money market accounts
Assets:
Cash equivalents:	26,301	89,119
Fair Value, Recurring | Money market accounts | Level 1
Assets:
Cash equivalents:	26,301	89,119
Fair Value, Recurring | Money market accounts | Level 2
Assets:
Cash equivalents:	$ 0	$ 0

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Fair value portion of asset recognized for present right to economic benefit.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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