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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2019
Sep. 09, 2019
Dec. 31, 2018
Document And Entity Information      
Entity Registrant Name LIGHTPATH TECHNOLOGIES INC    
Entity Central Index Key 0000889971    
Document Type 10-K    
Document Period End Date Jun. 30, 2019    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Is Entity a Well-known Seasoned Issuer? No    
Is Entity a Voluntary Filer? No    
Is 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   25,827,265  
Entity Public Float     $ 30,121,560
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019