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Income Tax (Details) - Schedule of valuation allowance - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Schedule of valuation allowance [Abstract] |  |
Balance at the beginning of the year | ¥ 71,393 | ¥ 53,854
Business combination |  | 4,069
Disposal of subsidiaries |  | (4,394)
Addition/(decrease) during the year | 75,078 | 25,457
Reversal |  | (7,593)
Balance at the end of the year | ¥ 146,471 | ¥ 71,393

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- Definition Business combination. + References No definition available. + Details
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Namespace Prefix: | metx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries or equity method investee. + References No definition available. + Details
Name: | metx_GainLossOnSaleOfStockIntheSubsidiaryOrEquityMethodInvestee
Namespace Prefix: | metx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The increase (decrease) during the addition/(decrease) during the year. + References No definition available. + Details
Name: | metx_IncreaseDecreaseInAdditiondecreaseDuringTheYear
Namespace Prefix: | metx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | metx_ScheduleOfValuationAllowanceAbstract
Namespace Prefix: | metx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + 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_DeferredTaxAssetsNet
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of expense reversal of valuation allowance on financing receivable transferred to held-for-investment classification. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120238483&loc=SL120268815-111004 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration