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Accounts Payable | 3 Months Ended
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Sep. 30, 2011
Accounts Payable [Abstract] (Deprecated 2009-01-31) |
Accounts Payable | 6. Accounts Payable The accounts payable balance includes $43,000 of related party transactions for board of directors’ fees as of September 30, 2011 and June 30, 2011.

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- Definition The disclosure of accounts payables of related party. + Details
Name: | LPTH_AccountsPayableTextBlock
Namespace Prefix: | lpth
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsPayableAbstract
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration