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Fair Value Measurements (Other financial instruments not measured at fair value in the balance sheets) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Fair Value Measurements [Abstract]
Estimated fair value of convertible loans	$ 15.8

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- Definition

Estimated fair value of convertible loans.

+ References

No definition available.

+ Details

Name:	feng_EstimatedFairValueOfConvertibleLoans
Namespace Prefix:	feng_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration