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Significant Accounting Policies (Details Narrative) (USD $)	3 Months Ended
	Sep. 30, 2014
Raytheon Vision Systems [Member]
Gross contract amount	$ 1,100,000
Lower Range [Member]
Vesting period of options and RSUs	2 years
Upper Range [Member]
Vesting period of options and RSUs	4 years
Property and Equipment [Member] | Lower Range [Member]
Estimated Life (Years)	3 years
Property and Equipment [Member] | Upper Range [Member]
Estimated Life (Years)	10 years

X

- Definition

The amount of the contract with Raytheon Vision Systems for which revenue is recognized on a percentage of completion basis.

+ References

No definition available.

+ Details

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

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration