Name:	lpth_ESOPCompensationPercentageThreshold
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The lower limit percentage against market value at which an employee may purchase shares of common stock through payroll deductions under the 2004 Employee Stock Purchase Plan.

No definition available.

Name:	lpth_ESOPPercentageMarketValue
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Data Type:	num:percentItemType
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Period Type:	duration

The discount on the purchase of shares of common stock due to the spread against market value under the 2004 Employee Stock Purchase Plan that was recognized during the period and recorded in selling, general and administrative expense.

No definition available.

Name:	lpth_EmployeeStockOwnershipPlanESOPDiscount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The assumed forfeiture rate used in calculating the fair value of option grants with both performance and service conditions.

No definition available.

Name:	lpth_FairValueForfeitureRateOptions
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Data Type:	num:percentItemType
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The assumed forfeiture rate used in calculating the fair value of RSUs with both performance and service conditions.

No definition available.

Name:	lpth_FairValueForfeitureRateRSUs
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Data Type:	num:percentItemType
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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on RSUs which were exercised (or share units converted) into shares during the reporting period under the plan.

No definition available.

Name:	lpth_ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsExercisesInPeriodTotalIntrinsicValue
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Data Type:	xbrli:monetaryItemType
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The six-month limit as to the number of shares of common stock which may be purchased by a participant under the 2004 Employee Stock Purchase Plan.

No definition available.

Name:	lpth_SixMonthLimitOnPurchaseOfCommonStockShares
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Data Type:	xbrli:sharesItemType
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Period Type:	instant

The yearly limit as to the number of shares of common stock which may be purchased by a participant under the 2004 Employee Stock Purchase Plan.

No definition available.

Name:	lpth_YearlyLimitOnPurchaseOfCommonStockShares
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Data Type:	xbrli:sharesItemType
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The yearly limit as to the total value of shares of common stock which may be purchased by a participant under the 2004 Employee Stock Purchase Plan.

No definition available.

Name:	lpth_YearlyLimitOnPurchaseOfCommonStockValue
Namespace Prefix:	lpth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:durationItemType
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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
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Data Type:	xbrli:durationItemType
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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:monetaryItemType
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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_EmployeeStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: