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Defined Contribution Retirement Plans (Details Narrative ) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Defined Contribution Retirement Plans |  |
Contributions made | $ 0.2 | $ 0.1
Description of plan | Under the LightPath Plan, the Company matches 100% of the first 2% of employee contributions |

X
- References No definition available. + Details
Name: | lpth_DescriptionOfPlan
Namespace Prefix: | lpth_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAdditionalInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration