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Deferred Revenue/Costs in Exces of Billings (Details Narrative) (Raytheon Vision Systems [Member], USD $)	Sep. 30, 2014
Raytheon Vision Systems [Member]
Gross contract amount	$ 1,100,000
Manufacturing Program - Raytheon Vision Systems	$ 13,400,000

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 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