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Organization, Basis of Presentation and Liquidity (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Noncontrolling Interest [Line Items]        
Accumulated deficit $ (192,357,575)us-gaap_RetainedEarningsAccumulatedDeficit $ (182,190,207)us-gaap_RetainedEarningsAccumulatedDeficit    
Shareholders' equity 57,511,784us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 62,722,765us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest    
Cash and cash equivalents 25,829,533us-gaap_CashAndCashEquivalentsAtCarryingValue 29,486,909us-gaap_CashAndCashEquivalentsAtCarryingValue 6,637,834us-gaap_CashAndCashEquivalentsAtCarryingValue 5,495,478us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent [Member]        
Noncontrolling Interest [Line Items]        
Accumulated deficit (192,357,575)us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember		      
Working capital 20,341,461us-gaap_Capital
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember		      
Shareholders' equity 57,511,784us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember		      
Cash and cash equivalents $ 25,829,533us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember		      
Asterias Biotherapeutics, Inc.        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 67.50%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_AsteriasBiotherapeuticsMember		      
BioTime Asia, Limited [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 81.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_BiotimeAsiaLimitedMember		      
Cell Cure Neurosciences, Ltd. [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 62.50%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_CellCureNeurosciencesLtdMember		 [1]      
ES Cell International Pte., Ltd. [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_EsCellInternationalPteLtdMember		      
LifeMap Sciences, Inc. [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 75.80%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_LifemapSciencesIncMember		      
LifeMap Sciences, Ltd. [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 0.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_LifemapSciencesLtdMember		 [2]      
LifeMap Solutions, Inc. [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 0.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_LifemapSolutionsIncMember		 [2]      
OncoCyte Corporation [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 75.30%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_OncocyteCorporationMember		      
OrthoCyte Corporation [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_OrthocyteCorporationMember		 [3]      
ReCyte Therapeutics, Inc. [Member]        
Noncontrolling Interest [Line Items]        
BioTime Ownership (in hundredths) 94.80%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= btx_RecyteTherapeuticsIncMember		      
[1] Includes shares owned by BioTime, Asterias, and ESI.
[2] LifeMap Sciences, Ltd. and LifeMap Solutions, Inc. are wholly-owned subsidiaries of LifeMap Sciences, Inc.
[3] Includes shares owned by BioTime and Asterias.