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Income Tax (Details) - Schedule of valuation allowance - CNY (¥) ¥ in Thousands	12 Months Ended
	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

X

- Definition

Business combination.

+ References

No definition available.

+ Details

Name:	metx_BusinessCombination
Namespace Prefix:	metx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- 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

X

- References

No definition available.

+ Details

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

X

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

X

- 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

Name:	us-gaap_FinancingReceivableTransferToHeldForInvestmentValuationAllowanceExpenseReversal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration