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Document and Entity Information - shares
 6 Months Ended
Dec. 31, 2016
Feb. 13, 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 Dec. 31, 2016  
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   23,726,787
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2017