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Organization and Principal Activities - Loan Agreements (Details) |  | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2019
Contractual Agreements Between Primary Beneficiaries And Variable Interest Entities [Abstract] |  |
Term of each loan agreements |  | 10 years
Extended term of loan upon expiration of original term | 10 years |

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- Definition Contractual agreements between primary beneficiaries and variable interest entities abstract. + References No definition available. + Details
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Namespace Prefix: | feng_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Extended term of loan upon expiration of original term. + References No definition available. + Details
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Namespace Prefix: | feng_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Represents terms of the agreements, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | feng_TermOfEachLoanAgreements
Namespace Prefix: | feng_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration