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Document and Entity Information - shares		6 Months Ended
		Jun. 30, 2018	Aug. 02, 2018
Document and Entity Information [Abstract]
Entity Registrant Name		PeerStream, Inc.
Entity Central Index Key		0001355839
Trading Symbol		PEER
Amendment Flag		false
Current Fiscal Year End Date		--12-31
Document Type		10-Q
Document Period End Date		Jun. 30, 2018
Document Fiscal Year Focus		2018
Document Fiscal Period Focus		Q2
Entity Filer Category		Smaller Reporting Company
Entity Common Stock, Shares Outstanding	[1]		6,723,745
[1] Excludes 158,571 shares of unvested restricted stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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