Annual report pursuant to Section 13 and 15(d)

4. Significant Strategic Drug Development Collaborations (Details Narrative)

v2.4.1.9
4. Significant Strategic Drug Development Collaborations (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Shares issued for equity investment, value $ 10,811,196us-gaap_StockIssuedDuringPeriodValueNewIssues  
Revenue recognized 0us-gaap_Revenues 1,000,000us-gaap_Revenues
Baxter Healthcare    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Shares issued for equity investment, shares 10,695,187us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_BaxterMember
 
Shares issued for equity investment, value 10,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_BaxterMember
 
Revenue recognized   1,000,000us-gaap_Revenues
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_BaxterMember
Percent ownership in Xenetic 8.70%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_BaxterMember
1.80%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_BaxterMember
SynBio LLC    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Revenue recognized 0us-gaap_Revenues
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_SynBioMember
 
Warrant granted to purchase common stock 6,745,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_SynBioMember
 
Serum Institute of India Ltd    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Revenue recognized $ 0us-gaap_Revenues
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_SerumInstituteMember
 
Percent ownership in Xenetic 9.20%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_SerumInstituteMember
10.60%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_SerumInstituteMember
Warrant granted to purchase common stock 3,200,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= xbio_SerumInstituteMember