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Compensatory Equity Incentive Plan and Other Equity Incentives (Details)	Dec. 31, 2013
Award shares, authorized	2,915,625
Award shares, outstanding	1,507,458
Available for issuance	675,021
Amended and Restated Omnibus Incentive Plan
Award shares, authorized	2,715,625
Award shares, outstanding	1,507,458
Available for issuance	569,103
Employee Stock Purchase Plan
Award shares, authorized	200,000
Award shares, outstanding
Available for issuance	105,918

X

- Definition

The number of shares pertaining to the outstanding awards as of the balance sheet.

+ References

No definition available.

+ Details

Name:	LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingNumber
Namespace Prefix:	LPTH_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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X

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

+ Details

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