Name:	lpth_DisposalGroupIncludingDiscontinuedOperationConsiderationInterestRate
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Data Type:	dtr-types:percentItemType
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Period Type:	instant

Default interest rate of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

No definition available.

Name:	lpth_DisposalGroupIncludingDiscontinuedOperationConsiderationInterestRateDefault
Namespace Prefix:	lpth_
Data Type:	dtr-types:percentItemType
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Period Type:	instant

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

No definition available.

Name:	lpth_DisposalGroupIncludingDiscontinuedOperationConsiderationMinimumYearlyPayment
Namespace Prefix:	lpth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The cost of products procured from the disposal group, as a percent of cost plus the given percent.

No definition available.

Name:	lpth_DisposalGroupIncludingDiscontinuedOperationCostOfProducts
Namespace Prefix:	lpth_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The percent increase to the cost of products acquired from the disposal group.

No definition available.

Name:	lpth_DisposalGroupIncludingDiscontinuedOperationCostOfProductsIncrease
Namespace Prefix:	lpth_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The percent of the disposal group sold.

No definition available.

Name:	lpth_DisposalGroupIncludingDiscontinuedOperationPercentSold
Namespace Prefix:	lpth_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-3

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Name:	srt_StatementScenarioAxis=lpth_InitialRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_StatementScenarioAxis=lpth_RateAfter2MillionMember
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