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Liquidity (Details Narrative)	9 Months Ended
	Mar. 31, 2022
Liquidity
Cash And Cash Equivalents Held By Foreign Subsidiaries	50.00%

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- References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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