Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2020	Feb. 01, 2021
Cover [Abstract]
Entity Registrant Name	LIGHTPATH TECHNOLOGIES INC
Entity Central Index Key	0000889971
Document Type	10-Q
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Entity File Number	000-27548
Entity's Reporting Status Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		26,138,292
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021