Registration of securities issued in business combination transactions

Document and Entity Information

Document and Entity Information - USD ($)
3 Months Ended
Mar. 31, 2019
May 06, 2019
Mar. 15, 2019
Jun. 29, 2018
Document And Entity Information [Abstract]        
Document Type S-4/A      
Amendment Flag false      
Document Period End Date Mar. 31, 2019      
Document Fiscal Year Focus 2019      
Document Fiscal Period Focus Q1      
Trading Symbol XBIO      
Entity Registrant Name Xenetic Biosciences, Inc.      
Entity Central Index Key 0001534525      
Current Fiscal Year End Date --12-31      
Entity Filer Category Non-accelerated Filer      
Entity Public Float       $ 16,464,779
Entity Common Stock, Shares Outstanding   10,443,889 10,443,889  
Current Reporting Status Yes      
Entity Small Business true      
Entity Emerging Growth false      
Entity Transition Period false