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Income Taxes - Combined effects of income tax expense exemption and other preferential tax treatment (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CNY (¥) ¥ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 CNY (¥) ¥ / shares | Dec. 31, 2017 CNY (¥) ¥ / shares
Income Tax Disclosure [Abstract] |  |  |  |
Effect of preferential tax treatment | ¥ (40,054) | $ (5,753) | ¥ (16,128) | ¥ 6,836
Basic net income/(loss) per share effect | (per share) | ¥ (0.07) | $ (0.01) | ¥ (0.03) | ¥ 0.01

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- Definition The combined effect of the income tax exemption and other preferential tax benefits available to the entity granted by the taxing jurisdiction. + References No definition available. + Details
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Namespace Prefix: | feng_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The per share amount combined effect of the income tax exemption and other preferential tax benefits available to the entity granted by the taxing jurisdiction. + References No definition available. + Details
Name: | feng_PreferentialTaxRateEffectPerShare
Namespace Prefix: | feng_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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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