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Derivative Financial Instruments (Warrant Liability) (Details 1) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Level 3 inputs activity
Reclassification of warrant liability upon exercise	$ 0	$ 685,132
Warrant | Level 3
Level 3 inputs activity
Balance, beginning	$ 0	490,500
Reclassification of warrant liability upon exercise		(685,132)
Change in fair value of warrant liability		194,632
Balance, ending		$ 0

X

- Definition

The reclassification of warrant liability upon exercise in noncash investing or financing activities.

+ References

No definition available.

+ Details

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Namespace Prefix:	LPTH_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Details

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Namespace Prefix:
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Period Type:

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- Details

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