Name:	btx_DeferredLicenseAndConsultingFeesClassifiedAsNoncurrent
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for deferred license fee.

No definition available.

Name:	btx_DeferredLicenseFeesAmortizationExpenseAfterYearFive
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during in the remainder of the fiscal year following the latest fiscal year ended for deferred license fee.

No definition available.

Name:	btx_DeferredLicenseFeesAmortizationExpenseDueInRemainderOfFiscalYear
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for deferred license fee.

No definition available.

Name:	btx_DeferredLicenseFeesAmortizationExpenseYearFive
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for deferred license fee.

No definition available.

Name:	btx_DeferredLicenseFeesAmortizationExpenseYearFour
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for deferred license fee.

No definition available.

Name:	btx_DeferredLicenseFeesAmortizationExpenseYearThree
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for deferred license fee.

No definition available.

Name:	btx_DeferredLicenseFeesAmortizationExpenseYearTwo
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Carrying amounts as of the balance sheet of related prepaid expenses which are classified in other current assets on the balance sheet.

No definition available.

Name:	btx_PrepaidExpensesInOtherCurrentAssets
Namespace Prefix:	btx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

The carrying amount of deferred costs.

No definition available.

Name:	us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.