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Income Taxes - Movement of valuation allowance of deferred tax assets (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Income Tax Disclosure [Abstract]
Balance as of January 1,	¥ 55,997	$ 8,043	¥ 14,208	¥ 11,402
Additions	70,709	10,158	37,584	6,164
Increase from an acquired subsidiary	997	143	8,576
Reversals	(799)	(115)	(4,371)	(3,358)
Balance as of December 31,	¥ 126,904	$ 18,229	¥ 55,997	¥ 14,208

X

- Definition

Amount of additions in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

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Namespace Prefix:	feng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount valuation allowance deferred tax asset increase from an acquired subsidiary.

+ References

No definition available.

+ Details

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Namespace Prefix:	feng_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of reversals in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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