Annual report pursuant to Section 13 and 15(d)

9. Stockholders' Equity (Details Narrative)

v2.4.1.9
9. Stockholders' Equity (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Stock issued for equity investment $ 10,811,196us-gaap_StockIssuedDuringPeriodValueNewIssues  
Research and development expense 6,323,896us-gaap_ResearchAndDevelopmentExpense 3,082,384us-gaap_ResearchAndDevelopmentExpense
SynBio Partner Warrants    
Warrant issued to purchase common stock 320,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_ClassOfWarrantOrRightAxis
= xbio_SynBioPartnerWarrantsMember
 
Fair value of warrant at date of grant 24,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= xbio_SynBioPartnerWarrantsMember
 
SynBio 2014 Warrant    
Warrant issued to purchase common stock 6,745,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_ClassOfWarrantOrRightAxis
= xbio_Synbio2014WarrantMember
 
Fair value of warrant at date of grant 506,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= xbio_Synbio2014WarrantMember
 
Baxter Healthcare    
Stock issued for equity investment, shares 10,695,187us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_BaxterMember
 
Stock issued for equity investment 10,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_BaxterMember
 
Warrant issued to purchase common stock 4,588,298us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_BaxterMember
 
Fair value of warrant at date of grant 932,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_BaxterMember
 
FDS Pharma    
Stock issued for services, shares 3,244,784us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_FDSPharmaMember
 
Research and development expense 812,000us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_FDSPharmaMember
 
Serum Institute Partner Warrant    
Warrant issued to purchase common stock 160,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_SerumInstitutePartnerWarrantMember
 
Fair value of warrant at date of grant 24,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_SerumInstitutePartnerWarrantMember
 
Non-employee director    
Warrant issued to purchase common stock 1,600,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_NonEmployeeDirectorMember
 
Fair value of warrant at date of grant 240,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_NonEmployeeDirectorMember
 
Serum Institute 2014 Warrant    
Warrant issued to purchase common stock 3,200,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_SerumInstitute2014WarrantMember
 
Fair value of warrant at date of grant $ 480,000us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= xbio_SerumInstitute2014WarrantMember