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v3.20.1

Income Taxes - Movement of valuation allowance (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Income Tax Disclosure [Abstract] |  |  |  |
Additions in valuation allowance | ¥ 70,709 | $ 10,158 | ¥ 37,584 | ¥ 6,164

X
- Definition Amount of additions in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | feng_ValuationAllowanceDeferredTaxAssetAdditionsAmount
Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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