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Income taxes - Change in Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Beginning balance | $ 33,402 | $ 2,993 | $ 8,498
Deferred tax liabilities assumed through acquisitions | 0 | 0 | (8,498)
Charged to income tax expense | 16,115 | 30,409 | 2,993
Ending balance | $ 49,517 | $ 33,402 | $ 2,993

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- Definition Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
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Namespace Prefix: | blfs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of deferred tax assets valuation allowance charged to income tax expense. + References No definition available. + Details
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Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The amount of deferred tax liabilities assumed through acquisitions. + References No definition available. + Details
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Namespace Prefix: | blfs_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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