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Principal Accounting Policies - Employee social security and welfare benefits (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 (¥)
Employee social security and welfare benefits |  |  |  |
Employee social security and welfare benefits | ¥ 113.7 | $ 16.3 | ¥ 84.3 | ¥ 79.4

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- Definition The amount of employee social security and welfare benefits included as cost and expenses in the accompanying consolidated statements of comprehensive income. + References No definition available. + Details
Name: | feng_EmployeeSocialSecurityAndWelfareBenefits
Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Employee Social Security and Welfare Benefits [Abstract] + References No definition available. + Details
Name: | feng_EmployeeSocialSecurityAndWelfareBenefitsAbstract
Namespace Prefix: | feng_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration