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Principal Accounting Policies - Revenue recognition (Details) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Accounting Policies [Abstract] |  |  |  |
Agency service fees to third-party advertising agencies | ¥ 180.7 | $ 26.0 | ¥ 215.2 | ¥ 223.3
Revenues recognized from noncash transactions | 8.7 | 1.3 | 17.8 | ¥ 4.4
Revenue from advertising-for-advertising barter transactions | ¥ 7.4 | $ 1.1 | ¥ 4.7 |

X
- Definition The estimated and recorded amount in agency service fees to third-party advertising agencies. The Group provides cash incentives in the form of agency service fees to certain third-party advertising agencies based on sales performance, and accounts for such incentives as a reduction of revenue in accordance with ASC 605-50-25 Customer Payments and Incentives: Recognition. + References No definition available. + Details
Name: | feng_AgencyServiceFeesToThirdPartyAdvertisingAgencies
Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of non cash revenue from advertising-for-advertising barter transactions. + References No definition available. + Details
Name: | feng_NonCashRevenueFromAdvertisingForAdvertisingBarterTransactions
Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of revenue from noncash transactions. + References No definition available. + Details
Name: | feng_NonCashRevenueTransactions
Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration