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Related Party Transactions and Related Party Convertible Debt (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
sqft
Mar. 31, 2014
Feb. 28, 2015
Related Party Transaction [Line Items]      
Rent per month $ 5,050us-gaap_PaymentsForRent    
Area of office space (in square feet) 900us-gaap_AreaOfLand    
Proceeds from issuance of common shares 0us-gaap_ProceedsFromIssuanceOfCommonStock 8,182,559us-gaap_ProceedsFromIssuanceOfCommonStock  
Asterias Biotherapeutics, Inc. | Series A Common Stock [Member]      
Related Party Transaction [Line Items]      
Proceeds from issuance of common shares     5,500,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_CommonClassAMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_AsteriasBiotherapeuticsMember
Shares sold (in shares)     1,410,255us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_CommonClassAMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_AsteriasBiotherapeuticsMember
Stock price (in dollars per share)     $ 3.90us-gaap_SharePrice
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_CommonClassAMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_AsteriasBiotherapeuticsMember
Number of shares purchased (in shares)     1,025,640us-gaap_SharesIssued
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_CommonClassAMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_AsteriasBiotherapeuticsMember
Cell Cure Neurosciences, Ltd. [Member]      
Related Party Transaction [Line Items]      
Number of Cell Cure Neurosciences investors 2btx_NumberOfCellCureNeurosciencesInvestors
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Stated interest rate (in hundredths) 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Conversion price (in dollars per share) $ 20.00us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Estimated fair market value (in dollars per share) $ 41.00btx_EstimatedFairMarketValue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Principal and accumulated interest 470,876us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Accrued interest is payable period 3 years    
Effective annual interest rate (in hundredths) 23.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Carrying value of convertible notes 169,908us-gaap_ConvertibleNotesPayableCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Amount of convertible note 534,816us-gaap_ConvertibleDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember
   
Unamortized debt discount $ 364,908us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= btx_CellCureNeurosciencesLtdMember