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Income Tax (Details) - Schedule of non-current income tax payable - USD ($) $ in Thousands | 12 Months Ended
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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

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- 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

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

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- 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