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Compensatory Equity Incentive Plan and Other Equity Incentives (Details 3) (USD $)	Dec. 31, 2014
Stock Options	$ 117,225us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Restricted Stock Share/Units	477,748us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Total Unrecognized Compensation Cost	594,973us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Six Months Ended June 30, 2015 [Member]
Stock Options	24,665us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocationRemainderOfYearMember
Restricted Stock Share/Units	120,398us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocationRemainderOfYearMember
Total Unrecognized Compensation Cost	145,063us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocationRemainderOfYearMember
Year Ended June 30, 2016 [Member]
Stock Options	40,802us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation1yearMember
Restricted Stock Share/Units	211,931us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation1yearMember
Total Unrecognized Compensation Cost	252,733us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation1yearMember
Year Ended June 30, 2017 [Member]
Stock Options	31,074us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation2yearsMember
Restricted Stock Share/Units	120,513us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation2yearsMember
Total Unrecognized Compensation Cost	151,587us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation2yearsMember
Year Ending June 30, 2018 [Member]
Stock Options	17,310us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation3yearsMember
Restricted Stock Share/Units	24,906us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation3yearsMember
Total Unrecognized Compensation Cost	42,216us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation3yearsMember
Year Ended June 30, 2019 [Member]
Stock Options	3,374us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation4yearsMember
Total Unrecognized Compensation Cost	$ 3,374us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / lpth_PeriodAxis = lpth_EmployeeServiceShareBasedCompensationAllocation4yearsMember

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+ 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 (i)

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

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