Fair value measurement - Schedule of the Company's Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets:
Available-for-sale securities:	$ 68,917	$ 13,826
Fair Value, Recurring
Assets:
Assets	93,997	102,945
Fair Value, Recurring \| U.S. government securities
Assets:
Available-for-sale securities:	16,901	1,494
Fair Value, Recurring \| Corporate debt securities
Assets:
Available-for-sale securities:	41,358	9,000
Fair Value, Recurring \| Other debt securities
Assets:
Available-for-sale securities:	10,658	3,332
Fair Value, Recurring \| Convertible promissory note
Assets:
Available-for-sale securities:	2,041
Fair Value, Recurring \| Level 1
Assets:
Assets	45,944	91,011
Fair Value, Recurring \| Level 1 \| U.S. government securities
Assets:
Available-for-sale securities:	16,901	1,494
Fair Value, Recurring \| Level 1 \| Corporate debt securities
Assets:
Available-for-sale securities:	6,004	398
Fair Value, Recurring \| Level 1 \| Other debt securities
Assets:
Available-for-sale securities:	0	0
Fair Value, Recurring \| Level 1 \| Convertible promissory note
Assets:
Available-for-sale securities:	0
Fair Value, Recurring \| Level 2
Assets:
Assets	46,012	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:	35,354	8,602
Fair Value, Recurring \| Level 2 \| Other debt securities
Assets:
Available-for-sale securities:	10,658	3,332
Fair Value, Recurring \| Level 2 \| Convertible promissory note
Assets:
Available-for-sale securities:	0
Fair Value, Recurring \| Level 3
Assets:
Assets	2,041	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 \| Convertible promissory note
Assets:
Available-for-sale securities:	2,041
Fair Value, Recurring \| Money market accounts
Assets:
Cash equivalents:	23,039	89,119
Fair Value, Recurring \| Money market accounts \| Level 1
Assets:
Cash equivalents:	23,039	89,119
Fair Value, Recurring \| Money market accounts \| Level 2
Assets:
Cash equivalents:	0	0
Fair Value, Recurring \| Money market accounts \| Level 3
Assets:
Cash equivalents:	$ 0	$ 0

BIOLIFE SOLUTIONS INC 10-Q