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Inventory (Details)	3 Months Ended
Inventory (Details)	Mar. 31, 2021 USD ($)
Inventory Disclosure [Abstract]
inventory Obsolescence Totaling	$ 2,225

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- Definition

inventory Obsolescence Totaling.

+ References

No definition available.

+ Details

Name:	bthe_inventoryObsolescenceTotaling
Namespace Prefix:	bthe_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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