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Income Tax (Details) - Schedule of non-current income tax payable - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of non-current income tax payable [Abstract]
Beginning balance	$ 26,085	$ 6,801
Addition	7,633	19,284
Ending balance	$ 33,718	$ 26,085

X

- Definition

Non-current income tax payable.

+ References

No definition available.

+ Details

Name:	metx_NonCurrentIncomeTaxPayable
Namespace Prefix:	metx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

No definition available.

+ Details

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