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Derivative Financial Instruments (Warrant Liability) (Details) - Warrant [Member]	9 Months Ended	12 Months Ended
	Mar. 31, 2018 $ / shares $ / Unit	Jun. 30, 2017 $ / shares $ / Unit
Floor | $ / Unit	1.15	1.15
Probability price less than strike price	0.00%	4.70%
Probability of fundamental transaction occuring	0.00%	0.00%
Lower Limit [Member]
Equivalent volatility	21.06%	47.39%
Equivalent interest rate	0.95%	0.62%
Stock price	$ 2.56	$ 1.15
Fair value of call	$ 1.13	$ .30
Upper Limit [Member]
Equivalent volatility	162.92%	75.80%
Equivalent interest rate	1.14%	1.13%
Stock price	$ 2.60	$ 3.25
Fair value of call	$ 2.79	$ 2.04

X

- Definition

The probability that price is less than strike.

+ References

No definition available.

+ Details

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Namespace Prefix:	lpth_
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X

- Definition

Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

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X

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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X

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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X

- Definition

Price at which a dealer is willing to buy an instrument, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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X

- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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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_
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X

- Details

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X

- Details

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- Details

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