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Income Tax (Details) - Schedule of consolidated balance sheets - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of consolidated balance sheets [Abstract]
Deferred tax assets	¥ 6,997	¥ 4,200
Deferred tax liabilities	(7,661)	(14,085)
Net deferred tax liabilities	¥ (664)	¥ (9,885)

X

- Definition

Amount of deferred tax liability attributable to taxable temporary differences.

+ References

No definition available.

+ Details

Name:	metx_DeferredTaxLiabilitiesValue
Namespace Prefix:	metx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

+ References

No definition available.

+ Details

Name:	metx_NetDeferredTaxLiabilitiesValue
Namespace Prefix:	metx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	metx_ScheduleOfConsolidatedBalanceSheetsAbstract
Namespace Prefix:	metx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant