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Deferred Revenue/Costs in Exces of Billings (Details Narrative) (Raytheon Vision Systems [Member], USD $) | Sep. 30, 2014
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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