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Defined Contribution Plan (Details Narrative)	12 Months Ended
	Jun. 30, 2016 Number
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	24

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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

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- 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