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Principal Accounting Policies - Employee social security and welfare benefits (Details) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Employee social security and welfare benefits
Employee social security and welfare benefits	¥ 113.7	$ 16.3	¥ 84.3	¥ 79.4

X

- Definition

The amount of employee social security and welfare benefits included as cost and expenses in the accompanying consolidated statements of comprehensive income.

+ References

No definition available.

+ Details

Name:	feng_EmployeeSocialSecurityAndWelfareBenefits
Namespace Prefix:	feng_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Employee Social Security and Welfare Benefits [Abstract]

+ References

No definition available.

+ Details

Name:	feng_EmployeeSocialSecurityAndWelfareBenefitsAbstract
Namespace Prefix:	feng_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration