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Stock-based compensation - Narrative (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Mar. 18, 2025 | Mar. 08, 2024 | Jan. 03, 2023 | Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of exercisable service vesting-based stock options | $ 2,600,000 |  |  |  | $ 2,600,000 |  |  | $ 2,600,000 |  |
Intrinsic value of service vesting-based awards exercised |  |  |  |  | $ 200,000 |  | $ 500,000 | $ 200,000 | $ 1,100,000 |
Service based-vesting options granted (in shares) |  |  |  |  | 0 |  |  | 0 |  |
Weighted average remaining contractual life (year) |  |  |  |  |  |  |  | 8 months 12 days |  |
Stock based compensation expense |  |  |  |  | $ 5,895,000 |  | 4,134,000 | $ 15,897,000 | 12,233,000 |
Vesting period (year) |  |  |  |  |  |  |  | 4 years |  |
Options |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options | 0 |  |  |  | 0 |  |  | $ 0 |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options | $ 20,600,000 |  |  |  | 20,600,000 |  |  | 20,600,000 |  |
Fair value of PSA as of grant date |  |  |  |  | 2,400,000 |  | 1,700,000 | 7,100,000 | 7,100,000 |
Stock based compensation expense |  |  |  |  | $ 2,800,000 |  | 2,700,000 | $ 8,300,000 | 7,900,000 |
Period for recognition (year) |  |  |  |  |  |  |  | 2 years 8 months 12 days |  |
Granted (in shares) |  |  |  |  |  |  |  | 470,824 |  |
Grant date fair value (in dollars per share) | $ 17.91 |  |  |  | $ 17.91 |  |  | $ 17.91 |  | $ 16.00
Performance-based Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options | $ 900,000 |  |  |  | $ 900,000 |  |  | $ 900,000 |  |
Service based-vesting options granted (in shares) |  |  |  |  | 0 |  |  | 0 |  |
Fair value of PSA as of grant date | 1,900,000 |  |  |  |  |  |  |  |  |
Stock based compensation expense | (3,400,000) |  |  |  | $ 900,000 |  | 200,000 | $ 2,200,000 | 700,000 |
Period for recognition (year) |  |  |  |  |  |  |  | 2 months 12 days |  |
Granted (in shares) |  |  | 109,512 |  |  |  |  |  |  |
Grant date fair value (in dollars per share) |  |  | $ 17.36 |  |  |  |  |  |  |
Shares granted percentage |  |  |  |  |  | 200.00% |  |  |  | 100.00%
Incremental cost |  |  |  |  |  | $ 1,600,000 |  |  |  |
Performance-based Restricted Stock | Minimum |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total shareholder return attainment (percent) |  |  | 0.00% |  |  |  |  |  |  |
Performance-based Restricted Stock | Maximum |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total shareholder return attainment (percent) |  |  | 200.00% |  |  |  |  |  |  |
Market-based Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options | $ 7,700,000 |  |  |  | 7,700,000 |  |  | $ 7,700,000 |  |
Stock based compensation expense |  |  | $ 300,000 | $ 1,600,000 | $ 2,200,000 |  | 1,200,000 | $ 5,400,000 | 3,600,000 |
Period for recognition (year) |  |  |  |  |  |  |  | 1 year 1 month 6 days |  |
Granted (in shares) |  |  |  |  |  |  |  | 451,801 |  |
Grant date fair value (in dollars per share) | $ 33.02 |  |  |  | $ 33.02 |  |  | $ 33.02 |  | $ 25.69
Measurement date with a maturity period (year) |  |  |  |  |  |  |  | 2 years |  |
Dividend yield (percent) |  | 0.00% | 0.00% | 0.00% |  |  |  | 0.00% |  |
Aggregate fair value of the market-based awards that vested |  |  |  |  | $ 0 |  | $ 0 | $ 11,800,000 | $ 8,400,000 |
Market-based Restricted Stock | Minimum |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total shareholder return attainment (percent) |  | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Market-based Restricted Stock | Maximum |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Total shareholder return attainment (percent) |  | 200.00% | 200.00% | 200.00% |  |  |  |  |  |

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Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=blfs_MarketbasedRestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |