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Subsequent Events - Technology Transfer and License Agreement (Details Narrative) (Subsequent Event [Member], License Arrangement [Member], USD $)
 0 Months Ended
Apr. 28, 2015
Costs agreement $ 60,000us-gaap_LicenseCosts
Fees under licensing agreement 200,000us-gaap_LicensesRevenue
Installment Payment #1 [Member]
  
Fees under licensing agreement 100,000us-gaap_LicensesRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= us-gaap_NonsoftwareLicenseArrangementMember
/ lpth_PaymentArrangementAxis
= lpth_InstallmentPaymentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Installment Payment #2 [Member]
  
Fees under licensing agreement $ 100,000us-gaap_LicensesRevenue
/ us-gaap_DeferredRevenueArrangementTypeAxis
= us-gaap_NonsoftwareLicenseArrangementMember
/ lpth_PaymentArrangementAxis
= lpth_InstallmentPayment1Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember