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Principal Accounting Policies - Sales and marketing expenses (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 (¥)
Sales and marketing expenses |  |  |  |
Total advertising and promotion expenses including traffic acquisition expenses | ¥ 385.4 | $ 55.4 | ¥ 376.7 | ¥ 329.7
Total advertising and promotion expenses from advertising-for-advertising barter transactions | ¥ 7.3 | $ 1.0 | ¥ 4.3 |

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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising from advertising-for-advertising barter transactions. + References No definition available. + Details
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Namespace Prefix: | feng_
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Balance Type: | debit
Period Type: | duration

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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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