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Inventories (Details Narrative) - USD ($)	Sep. 30, 2019	Jun. 30, 2019
Raw materials	$ 3,667,721	$ 3,467,105
Inventory - Tooling
Raw materials	$ 2,300,000	$ 2,200,000

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- Definition

Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a)(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_InventoryRawMaterials
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=LPTH_ToolingRawMaterialsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: