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v3.26.1

Convertible Debt, Unsecured Senior Notes and Long-term Loans (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 22, 2022 USD ($) item | Dec. 31, 2023 USD ($) $ / shares shares | Jul. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Sep. 30, 2025 USD ($) | Dec. 31, 2023 USD ($) shares | Dec. 31, 2025 USD ($) shares | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) shares
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Amount withdrawn |  |  |  |  |  |  |  |  | $ 4,982,000
Loans repaid |  |  |  |  |  |  | $ 5,000,000 |  | 100,000,000
Unsecured senior notes | 2024 Senior Notes |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 800,000,000 |  |  |  |  |
Due date of the Notes |  |  |  | Jul. 05, 2024 |  |  |  |  |
Coupon interest (as a percent) |  |  |  | 3.50% |  |  |  |  |
Net proceeds to the company from the issuance |  |  |  | $ 793,300,000 |  |  |  |  |
Issuance costs |  |  |  | $ 6,700,000 |  |  |  |  |
Interest expense |  |  |  |  |  |  |  | $ 14,800,000 | 29,300,000
Unsecured senior notes | 2030 Senior Notes |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 750,000,000 |  |  |  |  |  |
Due date of the Notes |  |  | Jul. 08, 2030 |  |  |  |  |  |
Coupon interest (as a percent) |  |  | 3.375% |  |  |  |  |  |
Net proceeds to the company from the issuance |  |  | $ 740,300,000 |  |  |  |  |  |
Issuance costs |  |  | $ 9,700,000 |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | 26,300,000 | 26,300,000 | 26,300,000
Convertible notes | 2030 Convertible Notes |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 330,000,000 |  |  |  | $ 330,000,000 |  |  | $ 330,000,000
Coupon interest (as a percent) |  | 1.375% |  |  |  | 1.375% |  |  | 1.375%
Net proceeds to the company from the issuance |  | $ 317,400,000 |  |  |  |  |  |  |
Issuance costs |  | $ 12,600,000 |  |  |  |  |  |  |
Repurchase price (as a percent) |  | 100.00% |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 7,700,000 | 7,700,000 | $ 500,000
Convertible notes | ADS | 2030 Convertible Notes |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Company lent | shares |  | 6,233,785 |  |  |  | 6,233,785 |  |  | 6,233,785
Loan processing fee per share | $ / shares |  | $ 0.00025 |  |  |  |  |  |  |
Outstanding number of borrowed | shares |  |  |  |  |  |  | 6,233,785 |  |
Collateral posted |  | $ 0 |  |  |  | $ 0 |  |  | $ 0
Additional issuance cost |  | $ 2,000,000 |  |  |  |  |  |  |
Term and revolving facilities agreement |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,200,000,000 |  |  |  |  |  |  |  |
Maturity term (in years) | 5 years |  |  |  |  |  |  |  |
Number of arrangers | item | 23 |  |  |  |  |  |  |  |
Margin rate | 1.28% |  |  |  |  |  | 1.28% |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrMember |  |  |  |  |  |  |  |
Loans repaid |  |  |  |  | $ 5,000,000 | $ 100,000,000 |  |  |
Term and revolving facilities agreement | 2027 Loans |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 900,000,000 |  |  |  |  |  |  |  |
Maturity term (in years) | 5 years |  |  |  |  |  |  |  |
Amount withdrawn |  |  |  |  |  |  | $ 900,000,000 |  |
Interest expense |  |  |  |  |  |  | $ 48,500,000 | $ 56,600,000 | $ 63,900,000
Term and revolving facilities agreement | Revolving facility |  |  |  |  |  |  |  |  |
Convertible Senior Notes, Unsecured Senior Notes and Long-term Loans |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 300,000,000 |  |  |  |  |  |  |  |
Maturity term (in years) | 5 years |  |  |  |  |  |  |  |

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Namespace Prefix: | wb_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of arrangers with whom the agreement as entered. + References No definition available. + Details
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Namespace Prefix: | wb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=wb_UnsecuredSeniorNotes2024NotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wb_TermLoansAndRevolvingFacilitiesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=wb_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |