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FAIR VALUE OF FINANCIAL INSTRUMENTS, Liabilities Measured at Fair Value Using Level 3 Inputs (Details)	6 Months Ended
	Jun. 30, 2021 USD ($)
Other liabilities contingent consideration
Assumed percentage of royalty revenue until 2029	13.00%
Assumed percentage of royalty revenue from 2030 to 2038	7.00%
Percentage of royalty revenue post patent decline for first year	50.00%
Percentage of royalty revenue post patent decline after year one	10.00%
Percentage of income taxes projected as royalty savings	26.00%
Percentage of weighted average cost of capital	26.00%
Level 3 [Member]
Other liabilities contingent consideration
Balance at beginning	$ 20,110,000
Balance at ending	19,290,000
Level 3 [Member] | Contingent Consideration [Member]
Other liabilities contingent consideration
Balance at beginning	20,110,000
Fair value adjustment included in operating expenses	(820,000)
Balance at ending	$ 19,290,000

X

- Definition

Percentage of income taxes projected in terms of royalty savings due to use of different market assumptions and/or different valuation techniques.

+ References

No definition available.

+ Details

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Namespace Prefix:	btx_
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Period Type:	duration

X

- Definition

The percentage of royalty revenue assumed from 2030 to 2038 due to use of different market assumptions and/or different valuation techniques.

+ References

No definition available.

+ Details

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Namespace Prefix:	btx_
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Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of royalty revenue assumed until 2029 due to use of different market assumptions and/or different valuation techniques.

+ References

No definition available.

+ Details

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Namespace Prefix:	btx_
Data Type:	dtr-types:percentItemType
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X

- Definition

The percentage of royalty revenue after year one post patent decline due to use of different market assumptions and/or different valuation techniques.

+ References

No definition available.

+ Details

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Namespace Prefix:	btx_
Data Type:	dtr-types:percentItemType
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X

- Definition

The percentage of royalty revenue for first year post patent decline due to use of different market assumptions and/or different valuation techniques.

+ References

No definition available.

+ Details

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X

- Definition

Cash flows discounted by the liability specific weighted average cost of capital using the mid-point convention.

+ References

No definition available.

+ Details

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Namespace Prefix:	btx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

+ Details

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

X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

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- References

No definition available.

+ Details

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- Details

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- Details

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