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Accounts Payable (Details Narrative) (Board of Directors [Member], USD $)
Dec. 31, 2014
Jun. 30, 2014
Board of Directors [Member]
   
Accounts payable - related parties for directors' fees $ 64,000us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpth_BoardOfDirectorsMember
$ 55,000us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpth_BoardOfDirectorsMember