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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Summary of Significant Accounting Policies (Details) (USD $)	1 Months Ended	3 Months Ended
	Jun. 30, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]
Trade receivable		$ 605,800us-gaap_AccountsReceivableNetCurrent		$ 549,300us-gaap_AccountsReceivableNetCurrent
Grants receivable		260,300us-gaap_GrantsReceivableCurrent		492,600us-gaap_GrantsReceivableCurrent
Allowance for doubtful accounts		100,500		100,500
Property, Plant and Equipment [Line Items]
Foreign currency gain (loss) included in comprehensive loss		(53,167)	(107,240)
Foreign currency transaction gain (loss)		(205,149)	(10,212)
Income Taxes [Abstract]
Accrued interest and penalties		0	0
Deferred income tax benefit		(1,176,882)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,349,026)us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred income tax benefit, federal		1,251,000	1,151,000
Deferred income tax benefit, state taxes		74,000	198,000
Number of shares sold by subsidiary (in shares)	5,000,000btx_SharesSoldByThirdParty
Taxable gain on sale of subsidiary shares	10,300,000btx_TaxableGainOnSaleOfSubsidiaryShares
Tax payable on sale of subsidiary shares	$ 3,600,000btx_TaxPayableOnSaleOfSubsidiaryShares
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life		10 years
Treasury Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted loss per share (in shares)		4,893,942	10,546,137
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted loss per share (in shares)		4,266,605	5,491,301
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of diluted loss per share (in shares)		9,194,679	9,751,615
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life		10 years
Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Equipment useful life		36 months
Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Equipment useful life		120 months