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Income Tax (Details) - Schedule of consolidated balance sheets - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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