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Document and Entity Information	6 Months Ended
	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	PeerStream, Inc.
Entity Central Index Key	0001355839
Trading Symbol	PEER
Amendment Flag	false
Document Type	S-1
Document Period End Date	Jun. 30, 2018
Entity Filer Category	Non-accelerated Filer
Entity Emerging growth company	false
Entity Small Business	true

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