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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

X

- Definition

Amount of restricted net asset for consolidated and unconsolidated subsidiarie.

+ References

No definition available.

+ Details

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Namespace Prefix:	metx_
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Balance Type:	credit
Period Type:	instant

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureTextBlockSupplementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration