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Convertible Debentures (Details Narrative) (USD $)	0 Months Ended		6 Months Ended	12 Months Ended
	Mar. 25, 2013	Mar. 31, 2008	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 22, 2013	Aug. 01, 2008 Convertible Debentures [Member]
Amended percentage of debentures allowed to be converted by debt holders		25.00%
Warrants outstanding				2,127,230			950,974
Proceeds from the exercise of warrants			$ 970,315	$ 1,539,061
Debentures converted, shares	1,148,738
Debentures holding percentage - related parties	93.10%
Share price	$ 1.54					$ 0.79
Conversion incentive shares	559,448

X

- Definition

Percentage of convertible debt instruments to determine eligibility of conversion by debenture holder.

+ References

No definition available.

+ Details

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Namespace Prefix:	lpth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares issued as an incentive for conversion of debentures.

+ References

No definition available.

+ Details

Name:	lpth_ConversionIncentiveShares
Namespace Prefix:	lpth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of debenture holdings owned by related parties.

+ References

No definition available.

+ Details

Name:	lpth_DebenturesHoldingRelatedParty
Namespace Prefix:	lpth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant