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LEASES, Operating Lease (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) ft²
LEASES [Abstract]
Operating lease area | ft²	2,700
Annual rent (per square foot)	56.00
Operating lease payments	$ 25,331

X

- Definition

Amount of rent expense per square foot for leased asset.

+ References

No definition available.

+ Details

Name:	btx_AnnualRentPerSquareFoot
Namespace Prefix:	btx_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Area of leased property under operating lease.

+ References

No definition available.

+ Details

Name:	btx_OperatingLeaseArea
Namespace Prefix:	btx_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

+ Details

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