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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2020
May 01, 2020
Document and Entity Information [Abstract]    
Entity Registrant Name PeerStream, Inc.  
Entity Central Index Key 0001355839  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Type 10-Q  
Document Period End Date Mar. 31, 2020  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2020  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Common Stock, Shares Outstanding [1]   6,870,404
Entity File Number 000-52176  
Entity Incorporation State Country Code DE  
[1] Excludes 8,500 shares of common stock that are held as treasury stock by PeerStream, Inc.