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v3.21.1

Restricted net assets (Details) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 CNY (¥)
Disclosure Text Block Supplement [Abstract] |
General reserve percent income after tax to payment of dividends | 10.00%
Reserve funds registered capital percentage | 50.00%
Restricted net assets (in Yuan Renminbi) | ¥ 129,057

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- Definition Amount of restricted net asset for consolidated and unconsolidated subsidiarie. + References No definition available. + Details
Name: | metx_AmountOfRestrictedNetAssetForConsolidatedAndUnconsolidatedSubsidiarie
Namespace Prefix: | metx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition General reserve percent income after tax to payment of dividends. + References No definition available. + Details
Name: | metx_GeneralReservePercentIncomeAfterTaxToPaymentOfDividends
Namespace Prefix: | metx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Reserve funds registered capital percentage. + References No definition available. + Details
Name: | metx_ReserveFundsRegisteredCapitalPercentage
Namespace Prefix: | metx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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