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Costs in Excess of Billings or Deferred Revenue (Details Narrative) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
Deferred Revenue Contract - Raytheon Vision Systems |  |  | $ 1,100,000
Total Contract - Raytheon Vision Systems |  |  | 13,400,000
Deferred Revenue Recognized | 1,070,000 | 1,070,000 |
Billed Revenues |  |  |
Deferred Revenue Recognized |  | 743,500 |
Accounts Receivable |  |  |
Deferred Revenue Recognized |  | 451,000 |
Other Receivables |  |  |
Deferred Revenue Recognized |  | $ 323,500 |

X
- Definition The total value 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_DeferredRevenueContract
Namespace Prefix: | LPTH_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total value of the contract with Raytheon Vision Systems which has a deferred revenue purchase order/contract attached to it. + References No definition available. + Details
Name: | LPTH_RaytheonContract
Namespace Prefix: | LPTH_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: 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=6600647&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
Name: | us-gaap_DeferredRevenueRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration