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Leases, Operating Lease (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) ft²
Leases [Abstract] |
Operating lease area | 2,700
Annual rent (per square foot) | 56.00
Operating lease payments | $ | $ 25,000

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- 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

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- 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

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

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- 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