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Fair Value of Financial Instruments, Carrying Amount of Contingent Consideration Liabilities (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($)
Other liabilities contingent consideration [Abstract] |
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 [Abstract] |
Balance at beginning of period | $ 20,110,000
Balance at end of period | 19,930,000
Level 3 [Member] | Contingent Consideration [Member] |
Other liabilities contingent consideration [Abstract] |
Balance at beginning of period | 20,110,000
Fair value adjustment included in operating expenses | (180,000)
Balance at end of period | $ 19,930,000

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

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- 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
Name: | btx_PercentageOfRoyaltyRevenueAssumedFrom2030To2038
Namespace Prefix: | btx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
Name: | btx_PercentageOfRoyaltyRevenueAssumedUntil2029
Namespace Prefix: | btx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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

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- Definition Cash flows discounted by the liability specific weighted average cost of capital using the mid-point convention. + References No definition available. + Details
Name: | btx_PercentageOfWeightedAverageCostOfCapital
Namespace Prefix: | btx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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

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- References No definition available. + Details
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- Details
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- Details
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