Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2017	Nov. 07, 2017
Document And Entity Information
Entity Registrant Name	LIGHTPATH TECHNOLOGIES INC
Entity Central Index Key	0000889971
Document Type	10-Q
Trading Symbol	LPTH
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		24,539,858
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2018