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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement expected to be recognized in year four.

No definition available.

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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement in the next fiscal year.

No definition available.

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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement in the third fiscal year.

No definition available.

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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement in the second fiscal year.

No definition available.

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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2