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Defined Contribution Plan (Details Narrative) - Number | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2009 | Jun. 30, 2017
Defined Contribution Plan |  |
Number of employees |  | 31
Age of plan participant |  | 21 years
Employer matching contributions (percent) | 25.00% |
Employee contributions (percent) | 6.00% |
Plan name |  | ADP Total Source 401(k) plan

X
- Definition The minimum age of plan participant. + References No definition available. + Details
Name: | lpth_AgeOfPlanParticipant
Namespace Prefix: | lpth_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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

X
- 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 Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Name of defined contribution plan designed to provide retirement benefits. Includes, but is not limited to, legal name of plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanPlanName
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration