Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 01, 2019
Document And Entity Information [Abstract]    
Entity Registrant Name FINJAN HOLDINGS, INC.  
Entity Central Index Key 0001366340  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   27,625,204
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2019  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Current Reporting Status Yes  
Entity Shell Company false