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Document and Entity Information - shares
 9 Months Ended
Mar. 31, 2019
May 06, 2019
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, 2019  
Amendment Flag false  
Current Fiscal Year End Date --06-30  
Entity's Reporting Status Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding   25,813,895
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2019