XML 82 R52.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Stock-Based Compensation - Incentive Plan Details (Details) - shares |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2015 | Mar. 31, 2014 | Aug. 31, 2010 | Dec. 31, 2015 | Dec. 31, 2014
Stock-based compensation |  |  |  |  |
Number of additional shares for the plan |  |  |  | 21,684,000 | 1,000,000
2010 Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Term of share incentive plan |  |  | 10 years |  |
Ordinary shares reserved for issuance |  |  | 35,000,000 |  |
Amount that maximum number of ordinary shares available for issuance is reduced for every share issued pursuant to share option or share appreciation right |  |  | 1 |  |
Amount that maximum number of ordinary shares available for issuance is reduced for every share issued as restricted shares or pursuant to restricted share units |  |  | 1.75 |  |
2014 Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Term of share incentive plan | 10 years |  |  |  |
Ordinary shares reserved for issuance |  | 4,600,000 |  |  |
Number of additional shares for the plan |  | 1,000,000 |  |  |
One-time percentage increase on January 1, 2015 for maximum aggregate number of shares which may be issued (as a percent) | 10.00% |  |  |  |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount that maximum number of ordinary shares available for issuance is reduced for every share issued as restricted shares or pursuant to restricted share units. + References No definition available. + Details
Name: | wb_MaximumNumberOfOrdinarySharesAvailableForIssuanceReducedForEveryOneShareIssuedAsRestrictedShareOrPursuantToRestrictedShareUnit
Namespace Prefix: | wb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount that maximum number of ordinary shares available for issuance is reduced for every share issued pursuant to share option or share appreciation right. + References No definition available. + Details
Name: | wb_MaximumNumberOfOrdinarySharesAvailableForIssuanceReducedForEveryOneShareIssuedPursuantToShareOptionOrShareAppreciationRight
Namespace Prefix: | wb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the one-time increase in shares available for issuance under plan upon specified date as a percentage of total outstanding shares. + References No definition available. + Details
Name: | wb_ShareBasedCompensationArrangementByShareBasedPaymentAwardAutomaticIncreaseInSharesAvailableForIssuanceUnderPlanAsPercentageOfTotalSharesOutstanding
Namespace Prefix: | wb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=wb_ShareIncentivePlan2010Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=wb_ShareIncentivePlan2014Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |