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Deferred Revenue/Costs in Exces of Billings (Details Narrative) (USD $) | 12 Months Ended
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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)

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- 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

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- 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