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Liquidity (Details Narrative)	6 Months Ended
	Dec. 31, 2020
Liquidity
Cash and cash equivalents held by foreign subsidiaries	50.00%

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- References

No definition available.

+ Details

Name:	lpth_CashAndCashEquivalentsHeldByForeignSubsidiaries
Namespace Prefix:	lpth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	lpth_LiquidityAbstract
Namespace Prefix:	lpth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration