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Document and Entity Information - shares
 9 Months Ended
Mar. 31, 2018
May 11, 2018
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 Mar. 31, 2018  
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   25,730,544
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2018