Organization and Principal Activities - Loan Agreements (Details)		12 Months Ended
Dec. 31, 2019	Dec. 31, 2019
Contractual Agreements Between Primary Beneficiaries And Variable Interest Entities [Abstract]
Term of each loan agreements		10 years
Extended term of loan upon expiration of original term	10 years

Represents terms of the agreements, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	feng_TermOfEachLoanAgreements
Namespace Prefix:	feng_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration