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Deferred Revenue/Costs in Exces of Billings (Details Narrative) (USD $)	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2014 Raytheon Vision Systems [Member]
Manufacturing Program - Raytheon Vision Systems		$ 13,400,000
Deferred Revenue recognized	$ 481,000	$ (36,500)

X

- Definition

The total amount of the manufacturing program of Raytheon Vision Systems which the compnay has received a purchase order.

+ References

No definition available.

+ Details

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

X

- Definition

The net addition or reduction in the carrying amount of deferred revenue during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).(Q1))

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

+ Details

Name:	us-gaap_DeferredRevenuePeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration