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Share-based Compensation (Effects of changes to forfeiture rate) (Details) - 12 months ended Dec. 31, 2016 ¥ in Millions, $ in Millions | CNY (¥) | USD ($)
--- | --- | ---
Change in forfeiture rate [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation reduced | ¥ 27.6 | $ 4.1

X
- Definition Decrease in share-based compensation expense due to the effects of changes to the forfeiture rate this period. + References No definition available. + Details
Name: | feng_DecreaseInShareBasedCompensationExpenseDueToEffectsOfChangesToForfeitureRateCurrentPeriod
Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
- Details
Name: | us-gaap_ChangeInAccountingEstimateByTypeAxis=feng_ChangeInForfeitureRateForShareBasedCompensationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |