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Income Taxes - Movement of valuation allowance of deferred tax assets (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] |  |  |  |
Balance as of January 1, | ¥ 55,997 | $ 8,043 | ¥ 14,208 | ¥ 11,402
Additions | 70,709 | 10,158 | 37,584 | 6,164
Increase from an acquired subsidiary | 997 | 143 | 8,576 |
Reversals | (799) | (115) | (4,371) | (3,358)
Balance as of December 31, | ¥ 126,904 | $ 18,229 | ¥ 55,997 | ¥ 14,208

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- 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

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- Definition The amount valuation allowance deferred tax asset increase from an acquired subsidiary. + References No definition available. + Details
Name: | feng_ValuationAllowanceDeferredTaxAssetIncreaseFromAcquiredSubsidiary
Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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