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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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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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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 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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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.

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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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Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Summary of Significant Accounting Policies [Abstract]
Trade receivable	$ 549,300us-gaap_AccountsReceivableNetCurrent	$ 575,900us-gaap_AccountsReceivableNetCurrent
Grants receivable	492,600us-gaap_GrantsReceivableCurrent	539,300us-gaap_GrantsReceivableCurrent
Allowance for doubtful accounts	100,500	116,800
Property, Plant and Equipment [Line Items]
Foreign currency gain (loss) included in comprehensive loss	122,936	122,469
Foreign currency transaction gain (loss)	338,076	133,479
Income Taxes [Abstract]
Deferred income tax benefit	(7,375,611)us-gaap_DeferredIncomeTaxExpenseBenefit	(3,280,695)us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred income tax benefit, federal	(5,155,000)	(2,800,000)
Deferred income tax benefit, state taxes	(2,221,000)	(480,000)
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
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)	3,974,326	4,567,135	3,681,301
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
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	10,697,715	1,800,109
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