SEGMENT INFORMATION - Narrative (Details)	3 Months Ended
Mar. 31, 2022 region country
Segment Reporting [Abstract]
Number of countries in which entity network marketing and distribution channels operates	24
Number of countries in which company operates facilities	11
Number of countries in which entity sells products	25
Number of regions in which company sells products \| region	3
Minimum percentage of revenue considered for accounted of major customer	10.00%

Represents minimum percentage of revenue considered for accounted of major customer.

No definition available.

Name:	mtex_MinimumPercentageOfRevenueConsideredForAccountedOfMajorCustomer
Namespace Prefix:	mtex_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Represents number of countries in which entity network marketing and distribution channels operates.

No definition available.

Name:	mtex_NumberOfCountriesInWhichEntityNetworkMarketingAndDistributionChannelsOperates
Namespace Prefix:	mtex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of countries in which the company sells product.

No definition available.

Name:	mtex_NumberOfCountriesInWhichEntitySellsProducts
Namespace Prefix:	mtex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of regions in which the company sells product.

No definition available.

Name:	mtex_NumberOfRegionsInWhichCompanySellsProducts
Namespace Prefix:	mtex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of countries in which the entity operates as of balance sheet date.

No definition available.

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

No definition available.

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