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Defined Contribution Plan (Details Narrative) | 12 Months Ended
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Jun. 30, 2015
Defined Contribution Plan |
Company's matching contribution percentage | 25.00%
Company's matching percentage, percent of gross pay | 6.00%
Number of employees enrolled in plan | 23

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

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of employees eligible to participate in the defined contribution plan or plans described. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanNumberOfEmployeesCovered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration